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            include   "d:/wice/inc/em78_headfile/em78p458.inc"      ;include
            em78p458 head file
            ;=================================================================================
            dly1    ==   0x30         ;delay register 1
            dly2    ==   0x31         ;delay register 2
            ;----------------------------------------------------------
                 org    0
                 jmp    start
                 org    0x08
                 reti
            start:
                 disi
                 MOV    a,@0b00000000
                 contw                         ;set cont register
                 bs     r9,5                   ; register segment
                 MOV    a,@0b00000000
                 iow    ioc51                  ;set port51,52 funtion
                 bc     r9,5                   ;
                 MOV    a,@0b01100000          ;bit6(CE)=1,enable comparator,
                                               ;bit5(coe)=1,set comparator
                 iow    ioca0    
                 MOV    a,@0b01100000
                 iow    ioc50                  ;set port56,57 input,
                 MOV    a,@0b00000000
                 iow    ioc60                  ;set port6 output   
            start1:    
                 MOV    a,@0b00010100
                 MOV    port5,a                ;CIN+<CIN-
                 nop
                 nop
                 call   compout                ;port60 output low
                 MOV    a,@0x32
                 call   delay                  ;delay time 5ms
                 ;
                 MOV    a,@0b00010010
                 MOV    port5,a                ;CIN+>CIN-
                 nop
                 nop
                 call   compout               ;port60 output high
                 MOV    a,@0x64
                 call   delay                 ;delay time 10ms
                ;
                 MOV    a,@0b00001100
                 MOV    port5,a               ;CIN+<CIN-
                 nop
                 nop
                 call   compout              ;Port60 output low
                 MOV    a,@0x96
                 call   delay                ;delay time 15ms      
                 ;
                 MOV    a,@0b00001010
                 MOV    port5,a
                 nop
                 nop
                 call   compout              ;port60 output high
                 MOV    a,@0xC8
                 call   delay                ;delay time 20ms
                 jmp    start1
            ;--------------------------    
            compout:                         ;port60 output subprogram
                 jbs    status,7
                 jmp    comparator0
            comparator1:
                 bs    port6,0
                 jmp   $+2
            comparator0:
                 bc    port6,0
                 ret
            ;---------------------   
            delay:                          ;delay time subprogram
                 MOV    dly1,a
            delay1:
                 MOV    a,@0x15               ;100us delay time,4MHz,clock=4
                 MOV    dly2,a
            delay2:    
                 djz    dly2
                 jmp    delay2
                 djz    dly1
                 jmp    delay1
                 ret
            ;-----------------
                 eop
                 end