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Re: 如何讓四位元的7-seg顯示不同的數字.....
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版主
 
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請參考"詳細解析PIC16F877原理與應用",洪正瑞編者,台科大
圖書公司出版
發表於: 2006/3/11 10:31
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如何讓四位元的7-seg顯示不同的數字.....
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新會員
 
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list p=16f877
include <P16F877.INC> errorlevel -302 __CONFIG _BODEN_OFF&_CP_OFF&_PWRTE_OFF&_WDT_OFF&_XT_OSC&_DEBUG_OFF&_CPD_OFF&_LVP_OFF ;********************************************** ORG 20H Dis_1 RES 1 Dis_2 RES 1 Dis_3 RES 1 Dis_4 RES 1 Scan RES 1 ;*********************************************** ORG 00H NOP GOTO Start Start CLRW CLRF PCLATH CLRF PORTB BANKSEL TRISB MOVLW B'11110000' MOVWF TRISB CLRF PORTD BANKSEL TRISD MOVLW B'00000111' MOVWF TRISD MOVLW Dis_1 MOVWF H'04' MOVLW B'0001' MOVWF H'00' MOVLW Dis_2 MOVWF H'04' MOVLW B'0010' MOVWF H'00' MOVLW Dis_3 MOVWF H'04' MOVLW B'0011' MOVWF H'00' MOVLW Dis_4 MOVWF H'04' MOVLW B'0100' MOVWF H'00' LOOP MOVLW Scan MOVWF H'04' MOVLW B'11111110' MOVWF H'00' MOVLW Dis_1 MOVWF H'04' LOOP1 MOVF H'00',0 BANKSEL PORTB MOVWF PORTB MOVLW Scan MOVF H'24',0 BANKSEL PORTD MOVWF PORTD BSF 3,0 RLF Scan,1 CALL DELAY INCF FSR,1 MOVF Dis_4,0 SUBWF FSR,0 BTFSS 3,2 GOTO LOOP1 GOTO LOOP DELAY MOVLW H'F0' MOVWF H'30' MOVLW H'F0' MOVWF H'31' DECFSZ H'31',1 GOTO $-1 DECFSZ H'30',1 GOTO $-5 RETURN END --------------------------------------------------------- 上面的程式動作目地是要讓四位元的7-seg顯示不同的數字 但出來的動作顯示卻一直不正確....... 不知道是我那裡的觀念不正確........ 煩請各位前輩指教........
發表於: 2006/3/9 14:04
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