单片机汇编实验六：I2C串行总线存储器读写实验

MOV R3,A //读出的字节传给R3
RET
STAR:SETB SDA //起始条件子程序
SETB SCL
NOP
NOP
NOP
NOP
CLR SDA
NOP
NOP
NOP
NOP
RET
SDATA:MOV R0,#08H //向24C02传输数据子程序
LOOP0:CLR SCL
RLC A
MOV SDA,C
NOP
NOP
SETB SCL
NOP
NOP
NOP
NOP
DJNZ R0,LOOP0
CLR SCL
NOP
SETB SDA
NOP
NOP
SETB SCL
REP:MOV C,SDA
JC REP
NOP
NOP
NOP
CLR SCL
NOP
NOP
RET
RDATA:MOV R0,#08H //从24C02读取数据子程序(读取一个字节以后不做应答)
LOOP1:SETB SCL
NOP
NOP
NOP
NOP
MOV C,SDA
RLC A
CLR SCL
NOP
NOP
NOP
NOP
DJNZ R0,LOOP1
SETB SCL
NOP
NOP
NOP
NOP
CLR SCL
RET
STOP:CLR SDA ;结束条件
NOP
NOP
NOP
NOP
SETB SCL
NOP
NOP
NOP
NOP
SETB SDA
NOP
NOP
NOP
NOP
RET
CHULI: //1999uS ;这里是用于写完数据以后留给24C02的内部数据处理时间，2ms是一个非常保险的时间，最短需要1ms
MOV R6,#04H
WR0:
MOV R5,#0F8H
DJNZ R5,$
DJNZ R6,WR0
RET
END

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