CAN接口汇编程序

MOV      R7,A
AJMP     CAN_RCVDATA
CAN_RCVYB:
MOV      R7,#02                            
CAN_RCVDATA:                            
MOV X     A,.DPTR
MOV     @R0,A
INC         DPTR
INC         R0
DJNZ     R7,CAN RCVDATA
CAN_DR_QUIT:
RET
CAN_CMD_PRG:
MOV      A,R7
CJNE     A,#01,CAN_CMDl                    
MOV      DPTR,#REG COMMAND                
MOV X     @DPTR,A                            
CLR     F0
RET
CAN_CMDl:
CJNE     A,#02,CAN_CMD2
MOV      DPTR,#REG STATUS                    
MOV X     A,@DPTR                            
SETB     F0
JB         ACC.5,CAN_CMDLQUIT
CLR     F0
CAN_CMD_QUIT:
RET
CAN_CMD2:
CJNE    #04,CAN CMD3                        
MOV      DPTR,# REG_COMMAND                
MOV X     @DPTR,A                            
NOP
NOP
MOV      DPTR,#REG STATUS                    
MOV X     A,.DPTR
SETB     F0
JB         ACC.0,CAN_DB_QUIT
CLR     F0
CAN_DB_QUIT:
RET
CAN_CMD3:
CJNE     A,#08,CAN_CMD4                    
MOV      DPTR,# REG_COMMAND                
MOV X     @DPTR,A                            
NOP
NOP
MOV      DPTR,#REG_STATUS                
MOV X     A,@DPTR
SETB     F0
JB         ACC.1,CAN_DOVER_QUIT
CLR     F0
CAN_DOVER_QUIT:
RET
SCAN CMD4:
CJNE     A,#10H,CAN_CMD5                    
MOV      DPTR,#REG_COMMAND                
MOV X    @DPTR,A                            
CLR     F0
CAN     CMD5:
RET

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本文关键字：接口  51单片机，单片机-工控设备 - 51单片机