?? count-down.asm
字號(hào):
list p=16f73 ; list directive to define processor
#include <p16f73.inc>; processor specific
PORTB EQU 0X006
PORTC EQU 0X007
COUNT EQU 0X021
default equ 0x022
BSF PORTC,0
; MOVLW 0X00
clrw
TRIS PORTB
TRIS PORTC
clrf default
loop1
movlw 0x0f
movwf default
loop
movf default,w
call decode
movwf PORTB
call delay
decfsz default
goto loop
movlw 0x00
call decode
movwf PORTB
call delay
goto loop1
decode ;二進(jìn)制到七段數(shù)碼顯示的查表程序
addwf PCL,f
retlw b'00111111' ;0
retlw b'00000110' ;1
retlw b'01011011' ;2
retlw b'01001111' ;3
retlw b'01100110' ;4
retlw b'01101101' ;5
retlw b'01111101' ;6
retlw b'00000111' ;7
retlw b'01111111' ;8
retlw b'01101111' ;9
retlw b'01110111' ;A
retlw b'01111100' ;b
retlw b'00111001' ;C
retlw b'01011110' ;d
retlw b'01111001' ;E
retlw b'01110001' ;F
return
delay ;延時(shí)子程序
MOVLW 0X7f
MOVWF COUNT
dLOOP1
DECFSZ COUNT
GOTO dLOOP1
return
END
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