STC micro STC8A8K64D4 Series - Page 641

STC8A8K64D4 Series Manual
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SDA BIT P1.4
SCL BIT P1.5
P0M1 DATA 093H
P0M0 DATA 094H
P1M1 DATA 091H
P1M0 DATA 092H
P2M1 DATA 095H
P2M0 DATA 096H
P3M1 DATA 0B1H
P3M0 DATA 0B2H
P4M1 DATA 0B3H
P4M0 DATA 0B4H
P5M1 DATA 0C9H
P5M0 DATA 0CAH
ORG 0000H
LJMP MAIN
ORG 0100H
START:
MOV A,#00000001B ;Send START command
MOV DPTR,#I2CMSCR
MOVX @DPTR,A
JMP WAIT
SENDDATA:
MOV DPTR,#I2CTXD ;Write data to the data buffer
MOVX @DPTR,A
MOV A,#00000010B ;Send a SEND command
MOV DPTR,#I2CMSCR
MOVX @DPTR,A
JMP WAIT
RECVACK:
MOV A,#00000011B ;Send read ACK command
MOV DPTR,#I2CMSCR
MOVX @DPTR,A
JMP WAIT
RECVDATA:
MOV A,#00000100B ;Send RECV command
MOV DPTR,#I2CMSCR
MOVX @DPTR,A
CALL WAIT
MOV DPTR,#I2CRXD ;Read data from the data buffer
MOVX A,@DPTR
RET
SENDACK:
MOV A,#00000000B ;Setup the ACK signal
MOV DPTR,#I2CMSST
MOVX @DPTR,A
MOV A,#00000101B ;Send ACK command
MOV DPTR,#I2CMSCR
MOVX @DPTR,A
JMP WAIT
SENDNAK:
MOV A,#00000001B ;Setup the NAK signal
MOV DPTR,#I2CMSST
MOVX @DPTR,A
MOV A,#00000101B ;Send ACK command