EM78P156e控制1621显示的汇编例子

            ASG4:
                    RRC     XS3
                    DJZ     XS1
                    JMP     AWS
                    RET
            YSA:
                    MOV     A,@2
                    MOV     XS3,A
            LOP1:
                    NOP
                    DJZ     XS3,A
                    JMP     LOP1
                    RET
            XSS:                     ;HT1621 XS 8-BITS  COMMAND MODE
                    BS      PORT5,1
                    BC      PORT5,0    ;CS=0
                    CALL    YSA
                    BC      PORT5,1
                    CALL    YSA
                    BS      PORT5,1   ;DATA=1
                    BC      PORT5,2
                    BC      PORT5,1
                    CALL    YSA
                    BS      PORT5,1   ;DATA=0
                    BC      PORT5,1
                    CALL    YSA
                    BS      PORT5,1  ;DATA=0
                    MOV     A,@8
                    MOV     XS1,A
            XSC:
                    JBS     XS2,7
                    JMP     XSD
                    BS      PORT5,2   ;DATA=1
                    JMP     XSG
            XSD:
                    BC      PORT5,2    ;DATA=0
            XSG:
                    BC      PORT5,1
                    CALL    YSA
                    BS      PORT5,1
                    RLC     XS2
                    DJZ     XS1
                    JMP     XSC
                    BC      PORT5,1
                    CALL    YSA
                    BS      PORT5,1     ;DATA=?
                    BS      PORT5,0    ;CS=1
                    RET
            XSA:            ;HT1621XS WRITE MODE
                    MOV     A,@8
                    MOV     XS1,A
            WXC:
                    JBS     XS2,7
                    JMP     WXD

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