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简洁的24C02读写ASM;--------------------------------------------I2C_SDA EQU P1.6 ; PIN 5 I2C_SCL EQU P1.7 ; PIN 6 ;============================================= I2C_WRITE: ; WRITE 8 BYTES TO EEROM ; INPUT: A - A*8 = EEROM START ADDR ; R0 - RAN START ADDR ; USE: C, A, R0, R6, R7 ACALL I2C_START ACALL OUT MOV R6, #8 WR_LP:MOV A, @R0 ACALL OUT INC R0 DJNZ R6, WR_LP AJMP I2C_STOP ;========================================== I2C_READ: ; READ 8 BYTES FROM EEROM ; INPUT: A - A*8 = EEROM START ADDR ; R0 - RAN START ADDR ; USE: C, A, R0, R6, R7 ACALL I2C_START ACALL OUT MOV R6, #8 MOV A, #0A1H; #RDCMD ACALL OUTS BRDLP: MOV R7, #8 SETB I2C_SDA INLP: CLR I2C_SCL ACALL DELAY6 SETB I2C_SCL NOP MOV C, I2C_SDA RLC A DJNZ R7, INLP CLR I2C_SCL MOV @R0, A INC R0 DJNZ R6, ACKLP ;;;;---------------------------- I2C_STOP: CLR I2C_SDA ACALL DELAY5 SETB I2C_SCL ACALL DELAY5 SETB I2C_SDA DELAY6: NOP DELAY5: NOP RET ;;----------------------------- I2C_START: SWAP A RR A MOV R6, A MOV A, #0A0H; #WTCMD ACALL OUTS MOV A, R6 RET ;------------------------------- ACKLP: CLR I2C_SDA SETB I2C_SCL ACALL DELAY5 CLR I2C_SCL AJMP BRDLP ;======================= OUTS: SETB I2C_SDA SETB I2C_SCL ACALL DELAY5 CLR I2C_SDA ACALL DELAY5 CLR I2C_SCL ;======================== OUT: SETB C MOV R7, #9 OTLP: RLC A NOP MOV I2C_SDA, C NOP NOP SETB I2C_SCL ACALL DELAY5 CLR I2C_SCL DJNZ R7, OTLP RET ;======================== END 上一篇：可进行脉冲计数的减法计数器－8253 下一篇：tlc0832实例汇编编程 简洁 ACALL mov SETB CLR 简洁 ACALL mov SETB CLR |
