EMC单片机写的I2C程序

                      MOV    A,@0XA1
                      CALL    IIC_WBYT
                      CALL    IIC_CACK
                      JBC    R3,GP        IF GP=1 OPTION AGAIN
                      JMP    IIC_R8BYT
                      READ 8 BYTES FROM 24C01
                      MOV    A,@IICBUF
                      MOV    R4,A
                      MOV    A,@7
                      MOV    GCNT,A
                  IIC_R8BYT1:
                      CALL    IIC_RBYT
                      MOV    R0,A
                      INC    R4
                      CALL    IIC_SACK
                      DJZ    GCNT
                      JMP    IIC_R8BYT1
                      CALL    IIC_RBYT
                      MOV    R0,A
                      CALL    IIC_SNACK
                      CALL    IIC_STOP
                      RET

                 
            ;********************************************************************
                  ;IIC_R1BYT,向2401的指定地址读出1个字节数据
                  ;地址由IICADDR指定，数据存在IICDAT0
                  IIC_R1BYT:
                      CALL    IIC_START
                      MOV    A,@0XA0
                      CALL    IIC_WBYT
                      CALL    IIC_CACK
                      JBC    R3,GP        IF GP=1 OPTION AGAIN
                      JMP    IIC_R1BYT
                      MOV    A,IICADDR
                      CALL    IIC_WBYT
                      CALL    IIC_CACK
                      JBC    R3,GP        IF GP=1 OPTION AGAIN
                      JMP    IIC_R1BYT
                      CALL    IIC_START
                      MOV    A,@0XA1
                      CALL    IIC_WBYT
                      CALL    IIC_CACK
                      JBC    R3,GP        IF GP=1 OPTION AGAIN
                      JMP    IIC_R1BYT
                      READ 1 BYTES FROM 24C01
                      CALL    IIC_RBYT
                      MOV    IICDAT0,A
                      CALL    IIC_SNACK
                      CALL    IIC_STOP

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本文关键字：单片机  程序  义隆单片机，单片机-工控设备 - 义隆单片机