Introduction To The AT89LP51RC2 Microcontroller Lecture AT89 Instructions
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University of British Columbia Electrical and Computer Engineering ELEC291/ELEC292 Introduction to the AT89LP51RC2 Microcontroller Dr. Jesús Calviño-Fraga P.Eng. Department of Electrical and Computer Engineering, UBC Office: KAIS 3024 E-mail: jesusc@ece.ubc.ca Phone: (604)-827-5387 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Objectives • Introduction to the AT89LP51RC2 microcontroller. • Introduction to the 8051 instruction set. • Understand how an assembler compiler is used and the files it generates. • Calculate machine code execution time. • Assemble a bread boarded AT89LP51RC2 microcontroller with LCD. • Write, compile, download, and run programs into the AT89LP51RC2/LCD microcontroller system. Introduction to the AT89LP51RC2 2 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 1 AT89LP51RC2 Introduction to the AT89LP51RC2 3 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. AT89LP51RC2 Introduction to the AT89LP51RC2 4 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 2 AT89LP51RC2 Somewhere in the Datasheet it says that it can run at up to 24 MHz, that is why I selected a 22.1184MHz crystal. Introduction to the AT89LP51RC2 5 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. AT89LP51RC2 Features • Industry standard. The 8051 is still a very common processor. • Very similar to original 8051/8052 from the 1980’s. Uses the well know 8051 instruction set. Can be made backward compatible. • DIP! Easy to breadboard. • 34 I/O pins. Also lots of useful peripherals. • External memory interface. Rare nowadays. • Lots of tools and resources. • Not too complicated. User manual is “only” 254 pages. • 1.7732 CA$ each in quantities of 100. Introduction to the AT89LP51RC2 6 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 3 AT89LP51RC2 Draw Backs • The built-in ADC (Analog to Digital Converter) is atrocious! Useless for ELEC291/292. We will be using an external ADC. • 8-bit processor. Well, this is an advantage sometimes! Introduction to the AT89LP51RC2 7 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. AT89LP51RC2 Pin Out Introduction to the AT89LP51RC2 8 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 4 AT89LP51RC2 block diagram Warning: it uses different instructions to access the different memory spaces! Figure taken from AT89LP51RC2 user manual Introduction to the AT89LP51RC2 9 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Assembling the AT89LP51RC2 Basic System. Using Boot Loader only. 5V 5V 5V 0.1µF VCC (40) TXD RXD GND (10) RXD (11) TXD Reset AT89LP51RC2 USB BO230XS VCC Out Boot P4.5 (29) XTAL2 (18) XTAL1 (19) (9) RST# 22.1148MHz 5V POL (31) GND (20) 5V Advantages: Fewer wires, more I/O, works on Windows, Linux, and Macs Introduction to the AT89LP51RC2 330Ω 0.1µF 10 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 5 Assembling the AT89LP51RC2 ISP System. Using SPI or Boot Loader. 5V 5V 5V 0.1µF VCC (40) USB (10) (11) (6) (7) (8) (5) TXD RXD RTS CTS CBUS3 GND RXD TXD MOSI MISO SCK SS Reset AT89LP51RC2 BO230XS VCC Out Boot P4.5 (29) XTAL2 (18) XTAL1 (19) (9) RST# Note: CBUS3 is pin 6 of J3 in BO230XS 22.1148MHz 5V POL (31) GND (20) 330Ω 5V SPI-ISP Advantages: Faster programming times, fast mode configuration, NO need to press buttons to start programming. 0.1µF Introduction to the AT89LP51RC2 11 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. BO230XS J3 and J1 Pins J1 J3 PIN Name PIN Name 1 VCC 1 VCC 2 CBUS2 2 CTS 3 GND 3 GND 4 CBUS1 4 RXD 5 CBUS0 5 TXD 6 CBUS3 6 RTS Introduction to the AT89LP51RC2 12 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 6 BOM (Bill of Materials) Quantity Description 2 0.1uF capacitors 1 330Ω resistor 1 LED 5MM GREEN 1 22.1184MHZ Crystal 1 BO230XS serial USB adapter 1 AT89LP51RC2 IC 80C51 MCU 32K FLASH 40-DIP 2 Push button switch Introduction to the AT89LP51RC2 13 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Assembling the AT89LP51RC2 System Wire length: 4 means 4 x 0.1 inches. 0.1 inches is the distance between adjacent holes in the breadboard. Introduction to the AT89LP51RC2 14 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 7 Assembling the AT89LP51RC2 System It should take about 30 minutes! Introduction to the AT89LP51RC2 15 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Assembling the AT89LP51RC2 System Introduction to the AT89LP51RC2 16 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 8 BO230XS • Very simple circuit that allows to connect to many different types of microcontrollers. • Adds serial port connection to computer via USB. • Allows for In System Programming (ISP) for many microcontrollers. Some examples: The whole AT89LP family from Atmel/Microchip, The C8051/EFM8 family from Silabs, Some STM32F ARMs from ST Microelectronics, the LPC824 ARM from NXP, all PIC32MX from Microchip, the ATMega328 (and other members of the family) from Atmel/Microchip, and some MSP430 from Texas Instruments. Introduction to the AT89LP51RC2 17 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Add LED/Resistor to P3.7 LED turns-on with logic zero. VCC=5V AT89LP51RC2 LED voltage drop @ 10mA (approx): IR=1.4V Red=1.8V Yellow=1.9V Green=2.0V Blue=2.9V 330Ω P3.7 I LED = 5V − 1.8V ≈ 10mA 330Ω Introduction to the AT89LP51RC2 18 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 9 Blinky ; Blinky.asm: toggles an LED attached to pin 17 (P3.7) $MODLP51 org 0000H ljmp myprogram ; When using a 22.1184MHz crystal in fast mode ; one cycle takes 1.0/22.1184MHz = 45.21123 ns WaitHalfSec: mov R2, #89 L3: mov R1, #250 L2: mov R0, #166 L1: djnz R0, L1 ; 3 cycles->3*45.21123ns*166=22.51519us djnz R1, L2 ; 22.51519us*250=5.629ms djnz R2, L3 ; 5.629ms*89=0.5s (approximately) ret myprogram: mov SP, #7FH M0: cpl P3.7 lcall WaitHalfSec sjmp M0 END Introduction to the AT89LP51RC2 19 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Compile “Blinky.asm” and flash “Blinky.hex”. • Download and install CrossIDE from the course web page. • Start CrossIDE and create a new assembly file. copy and paste the code from previous slides. Save as “Blinky.asm”. • Click Build->ASM51. Click the “Browse” button beside “Complete path of assembler” and select a51.exe from the “Call51\bin” folder where you installed CrossIDE. Then press “Ok”. Introduction to the AT89LP51RC2 20 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 10 Flash and run into the AT89LP51RC2 using Boot Loader • While pressing button “BOOT”, press and release button “RESET”. • On Crosside, click “fLash”->”Atmel 89LP Bootloader”. Make sure the file “Blinky.hex” is selected. Also make sure that the “Port” box is set to the USB port # assigned to the BO230XS. Click the “Flash” button and wait until it finishes. • Press and release “RESET”. The program starts running! Introduction to the AT89LP51RC2 21 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Flash and run into the AT89LP51RC2 using SPI-ISP • On Crosside, click “fLash”->”Atmel 89LP Using SPI”. Make sure the file “Blinky.hex” is selected. Click the “Flash” button and wait until it finishes. Done! (Works only on Windows) Introduction to the AT89LP51RC2 22 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 11 Summary: Blinky • To run “Blinky” in the AT89LP51RC2 we need to complete the following steps: 1. Assemble the AT89LP51RC2 Microcontroller system in a bread board. Attach LED to P3.7. (Or any other available pin, just change the code!) 2. Edit and Compile “Blinky.asm”. 3. Flash and run “Blinky.hex” into the AT89LP51RC2 processor. Introduction to the AT89LP51RC2 23 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 8051 Instruction Set 1. 2. 3. 4. 5. Arithmetic Operations Logical Operations Data Transfer Boolean Variable Manipulation Program Branching and Machine Control WARNING: I did my best to change the number of cycles per instruction to the actual values for the AT89LP51RC2, but there may be errors. The ultimate reference is the AT89LP51RC2 user manual! Note: not showing AT89LP51RC2 extended instructions. Introduction to the AT89LP51RC2 24 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 12 Arithmetic Operations (ADD) Mnemonic Opcode B C Function ADD A, Rn 28H-2FH 1 1 (A) = (A) + (Rn) ADD A, direct 25H 2 2 (A) = (A) + (direct) ADD A, @Ri 26H-27H 1 2 (A) = (A) + ((Ri)) ADD A, #data 24H 2 2 (A) = (A) + #data ADDC A, Rn 38H-3FH 1 1 (A) = (A) + (C) + (Rn) ADDC A, direct 35H 2 2 (A) = (A) + (C) + (direct) ADDC A, @Ri 36H-37H 1 2 (A) = (A) + (C) + ((Ri)) ADDC A,#data 34H 2 2 (A) = (A) + (C) + #data Introduction to the AT89LP51RC2 25 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Arithmetic Operations (SUB) Mnemonic Opcode B C Function SUBB A, Rn 98H-9FH 1 1 (A) = (A) - (C) - (Rn) SUBB A, direct 95H 2 2 (A) = (A) - (C) - (direct) SUBB A, @Ri 96H-97H 1 2 (A) = (A) - (C) - ((Ri)) SUBB A, #data 94H 2 2 (A) = (A) - (C) - #data Introduction to the AT89LP51RC2 26 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 13 Arithmetic Operations (INC) Mnemonic Opcode B C Function INC A 04H 1 1 (A) = (A) + 1 INC Rn 08H-0FH 1 1 (Rn) = (Rn) + 1 INC direct 05H 2 2 (direct) = (direct) + 1 INC @Ri 06H-07H 1 2 ((Ri)) = ((Ri)) + 1 INC DPTR A3H 1 2 (DPTR) = (DPTR) + 1 Introduction to the AT89LP51RC2 27 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Arithmetic Operations (DEC) Mnemonic Opcode B C Function DEC A 14H 1 1 (A) = (A) - 1 DEC Rn 18H-1FH 1 1 (Rn) = (Rn) - 1 DEC direct 15H 2 2 (direct) = (direct) -1 DEC @Ri 16H-17H 1 2 ((Ri)) = ((Ri)) - 1 Introduction to the AT89LP51RC2 28 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 14 Arithmetic Operations (Other) Mnemonic Opcode B C Function MUL AB A4H 1 2 (B15–8 ), (A7–0 ) = (A) x (B) DIV AB 84H 1 4 (B15–8 ), (A7–0 ) = (A) / (B) DA A D4H 1 1 Converts (A) to BCD Introduction to the AT89LP51RC2 29 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Logic Operations (AND) Mnemonic Opcode B C Function ANL A, Rn 58H-5FH 1 1 (A) = (A) AND (Rn) ANL A, direct 55H 2 2 (A) = (A) AND (direct) ANL A, @Ri 56H-57H 1 2 (A) = (A) AND ((Ri)) ANL A, #data 54H 2 2 (A) = (A) AND #data ANL direct, A 52H 2 2 (direct) = (direct) AND A ANL direct, #data 53H 3 3 (direct) = (direct) AND #data Introduction to the AT89LP51RC2 30 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 15 Logic Operations (OR) Mnemonic Opcode B C Function ORL A, Rn 48H-4FH 1 1 (A) = (A) OR (Rn) ORL A, direct 45H 2 2 (A) = (A) OR (direct) ORL A, @Ri 46H-47H 1 2 (A) = (A) OR ((Ri)) ORL A, #data 44H 2 2 (A) = (A) OR #data ORL direct, A 42H 2 2 (direct) = (direct) OR (A) ORL direct, #data 43H 3 3 (direct) = (direct) OR #data Introduction to the AT89LP51RC2 31 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Logic Operations (XOR) Mnemonic Opcode B C Function XRL A, Rn 68H-6FH 1 1 (A) = (A) XOR (Rn) XRL A, direct 65H 2 2 (A) = (A) XOR (direct) XRL A, @ Ri 66H-67H 1 2 (A) = (A) XOR ((Ri)) XRL A, #data 64H 2 2 (direct) = (A) XOR #data XRL direct, A 62H 2 2 (direct) = (direct) XOR (A) XRL direct, #data 63H 3 3 (direct) = (direct) XOR #data Introduction to the AT89LP51RC2 32 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 16 Logic Operations (Other) Mnemonic Opcode B C Function CLR A E4H 1 1 (A) = 0 CPL A F4H 1 1 (A) = (A’) RL A 23H 1 1 Rotate (A) Left RLC A 33H 1 1 Rotate (A) Left Through Carry RR A 03H 1 1 Rotate (A) Right RRC A 13H 1 1 Rotate (A) Right Through Carry SWAP A C4H 1 1 (A3-0 ) ↔ (A7-4 ) Introduction to the AT89LP51RC2 33 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Data Transfer (MOV 1 of 3) Mnemonic Opcode B C Function MOV A, Rn E8H-EFH 1 1 (A) = (Rn) MOV A, direct E5H 2 2 (A) = (direct) MOV A, @Ri E6H-E7H 1 1 (A) = ((Ri)) MOV A, #data 74H 2 2 (A) = #data MOV Rn, A F8H-FFH 1 1 (Rn) = (A) MOV Rn, direct A8H-AFH 2 2 (Rn) = (direct) MOV Rn, #data 78H-7FH 2 2 (Rn) = #data MOV direct, A F5H 2 2 (direct) = (A) MOV direct, Rn 88H-8FH 2 2 (direct) = (Rn) Introduction to the AT89LP51RC2 34 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 17 Data Transfer (MOV 2 of 3) Mnemonic Opcode B C Function MOV direct1, direct2 85H 3 3 (direct1) = (direct2) (source) (destination) MOV direct, @Ri 86H-87H 2 2 (direct) = ((Ri)) MOV direct, #data 75H 3 3 (direct) = #data MOV @Ri, A F6H-F7H 1 1 ((Ri)) = A MOV @Ri, direct A6H-A7H 2 2 ((Ri)) = (direct) MOV @Ri, #data 76H-77H 2 2 ((Ri)) = #data MOV DPTR, #data16 90H 3 3 (DPTR) = #data15-0 (DPH) = #data15-8 (DPL) = #data7-0 MOVC A, @A + DPTR 93H 1 3 (A) = ((A) + (DPTR)) Introduction to the AT89LP51RC2 35 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Data Transfer (MOV 3 of 3) Mnemonic Opcode B C Function MOVC A, @A + PC 83H 1 4 (A) = ((A) + (PC)) MOVX A, @Ri E2H-E3H 1 2 (A) = ((Ri)) MOVX A, @DPTR E0H 1 2 (A) = ((DPTR)) MOVX @Ri, A F2H-F3H 1 1 ((Ri)) = (A) MOVX @DPTR,A F0H 1 1 ((DPTR)) = (A) Introduction to the AT89LP51RC2 36 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 18 Data Transfer (Other) Mnemonic Opcode B C Function PUSH direct C0H 2 2 (SP) = (SP) + 1 ((SP)) = (direct) POP direct D0H 2 2 (direct) = ((SP)) (SP) = (SP) - 1 XCHA, Rn C8H-CFH 1 1 (A) = (Rn) XCHA, direct C5H 2 2 (A) = (direct) XCHA, @Ri C6H-C7H 1 2 (A) = ((Ri)) XCHD A, @Ri D6H-D7H 1 2 (A3-0) = ((Ri3-0 )) Introduction to the AT89LP51RC2 37 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Boolean Variable Manipulation Mnemonic Opcode B C Function CLR C C3H 1 1 (C) = 0 CLR bit C2H 2 2 (bit) = 0 SETB C D3H 1 1 (C) = 1 SETB bit D2H 2 2 (bit) = 1 CPL C B3H 1 1 (C) = (C) CPL bit B2H 2 2 (bit) = (bit) ANL C, bit 82H 2 2 (C) = (C) AND (bit) ANL C, bit’ B0H 2 2 (C) = (C) AND (bit’) ORL C, bit 72H 2 2 (C) = (C) OR (bit) ORL C, bit’ A0H 2 2 (C) = (C) OR (bit’) MOV C, bit A2H 2 2 (C) = (bit) MOV bit, C 92H 2 2 (bit) = (C) Introduction to the AT89LP51RC2 38 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 19 Program Branching (1 of 3) Mnemonic Opcode B C Function ACALL addr 11 AAA10001 2 3 (PC) = (PC) + 2 (PC10-0 ) = page address LCALL addr 16 12H 3 4 (PC) = addr15-0 RET 22H 1 4 Return from ACALL/CALL RETI 32H 1 4 Return from interrupt AJMP addr 11 AAA00001 2 3 (PC) = (PC) + 2 (PC10-0 ) = page address LJMP addr 16 02H 3 4 (PC) = addr15-0 SJMP rel 80H 2 3 (PC) = (PC) + 2 (PC) = (PC) + rel JMP @A + DPTR 73H 1 2 (PC) = (A) + (DPTR) Introduction to the AT89LP51RC2 39 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Program Branching (2 of 3) Mnemonic Opcode B C Function JZ rel 60H 2 2/3 (PC) = (PC) + 2 IF (A) = 0 THEN (PC) = (PC) + rel JNZ rel 70H 2 2/3 (PC) = (PC) + 2 IF (A) ≠ 0 THEN (PC) = (PC) + rel JC rel 40H 2 2/3 (PC) = (PC) + 2 IF (C) = 1 THEN (PC) = (PC) + rel JNC rel 50H 2 2/3 (PC) = (PC) + 2 IF (C) ≠0 THEN (PC) = (PC) + rel JB bit, rel 20H 3 3/4 (PC) = (PC) + 3 IF (bit) = 1 THEN (PC) = (PC) + rel JNB bit, rel 30H 3 3/4 (PC) = (PC) + 3 IF (bit) = 0 THEN (PC) = (PC) + rel JBC bit, rel 10H 3 3/4 (PC) = (PC) + 3 IF (bit) = 1 THEN (bit) = 0 and (PC) = (PC) + rel Introduction to the AT89LP51RC2 40 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 20 Program Branching (3 of 3) Mnemonic Opcode B C Function CJNE A, direct, rel B5H 3 4 Compare and jump if not equal rel CJNE A, #data, rel B4H 3 4 Compare and jump if not equal rel CJNE Rn, #data, B8H-BFH rel 3 4 Compare and jump if not equal rel CJNE @Ri, #data, rel B6H-B7H 3 4 Compare and jump if not equal rel DJNZ Rn, rel D8H-DFH 3 3 Decrement and Jump if not zero DJNZ direct,rel D5H 3 4 Decrement and Jump if not zero NOP 00H 1 1 (PC) = (PC) + 1 Introduction to the AT89LP51RC2 41 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. The 8051 Assembly Language Instruction • An Assembly language instruction consists of four fields: [label : ] mnemonic [operands] [;comment] • Examples: L1: MOV A, #’*’ ; Load Acc with ASCII for ‘*’ NOP ; We can just have comments! L3: ; We can also place labels anywhere DJNZ R0, L3 Introduction to the AT89LP51RC2 42 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 21 Writing and compiling an 8051 assembly language program EDITOR myfile.asm ASSEMBLER myfile.lst myfile.hex Microcontroller chip or soft-processor Introduction to the AT89LP51RC2 43 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. AT89LP51RC2 Block Diagram Interrupt Control MOVC 32k FLASH ROM MOV MOVX 256 bytes RAM 1152 bytes XRAM Timer 2 Timer 1 8-bit bus Internal Interrupts External Interrupts Timer 0 CPU Oscillator (Simplified) BUS CONTROL 5 I/O PORTS SERIAL PORT TXD RXD Notice the different instructions to access the different memory spaces! P0 P1 P2 P3 P4 Introduction to the AT89LP51RC2 44 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 22 Adding an LCD 5V VSS (1) VDD (2) V0 (3) (2) P1.1 (3) P1.2 (4) P1.3 2k RS (4) RW (5) E (6) D0 (7) AT89LP51RC2 (12) P3.2 (13) P3.3 (14) (15) P3.4 P3.5 D1 (8) D2 (9) LCD D3 (10) D4 (11) D5 (12) D6 (13) D7 (14) A (15) K (16) • Example configures LCD in 4-bit mode. Saves pins and wires! • Standard Hitachi HD44780 controller • Pin assignments arbitrary, but source code must match wiring •Pins 7, 8, 9, 10, 15, 16 not connected. Introduction to the AT89LP51RC2 45 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Soldering Wires to LCD Introduction to the AT89LP51RC2 46 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 23 AT89LP51RC2/LCD Introduction to the AT89LP51RC2 47 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Lab 1 Demo • ‘LCD_test_4bit.asm’: this a test program for the AT89LP51RC2/LCD with the pins as shown in previous slides. Test program prints ‘A’ in column 1 of row 1, and ‘B’ in column 3 of row 2. • Write your name (or a short version of it!) on row 1. Write your student number in row 2. • Add extra functionality/features for extra marks. • This lab could take you a long time to complete. Start early! • Be as neat as possible. You’ll be using the AT89LP51RC2/LCD system for the next three weeks! Introduction to the AT89LP51RC2 48 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 24 Save your ICs! • Integrated circuits (ICs) are delicate devices that can be damaged easily by: – Applying an inappropriate voltage. – Connecting live signals to the IC when not power up. – Electrostatic discharges. This happens frequently! Introduction to the AT89LP51RC2 49 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. Chairs Available in labs Introduction to the AT89LP51RC2 50 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 25 Electrostatic Discharges and The Blue/Gray Chairs of Death! • Some of the chairs in MCLD labs are blue/gray. • The blue/gray chairs are NOT really designed for an electronics lab use: they don’t dissipate electrostatic charge. The black foamy chairs are designed for lab use: they dissipate electrostatic charge. • If you are wearing a sweater, the air is dry, and you are seating in a blue chair you will likely get charged. If you discharge through your circuit it may permanently damage the ICs. Solution: before touching your circuit, touch the grounded metal rack in the work bench. Introduction to the AT89LP51RC2 51 © Jesús Calviño-Fraga, 2009-2019. Not to be copied, used, or revised without explicit written permission from the copyright owner. 26
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