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- UID
- 852722
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图 PIC单片机七段数码管接口电路图
基于PIC单片机的七段数码显示源程序
程序范例：
1。七段数码管显示器显示1234循环
2。七段显示器显示0000～9999（自动加1）循环
七段显示器显示1234循环:
范例一：7seg1.*
LIST P=16F877,R=DEC ;
#INCLUDE <P16F877.INC> MOVF DB1,0
CBLOCK H''20'' CALL TABLE
DB0,DB1 MOVWF PORTSEG
ENDC MOVLW H''FB''
; MOVWF PORTCA
PORTSEG EQU PORTD CALL DELAY25
TRISEG EQU TRISD BSF PORTCA,2
PORTCA EQU PORTB ;
TRICA EQU TRISB SWAPF DB1,0
; CALL TABLE
ORG 0 MOVWF PORTSEG
NOP MOVLW H''F7''
BANKSEL TRICA MOVWF PORTCA
MOVLW 0 CALL DELAY25
MOVWF TRICA BSF PORTCA,3
MOVWF TRISEG GOTO MAIN
BANKSEL PORTCA ;
MOVLW 0XFF TABLE: ANDLW H''0F''
MOVWF PORTCA ADDWF PCL
MOVLW H''12'' T1: RETLW H''C0'' ;’0’
MOVWF DB1 RETLW H''F9'' ;’1’
MOVLW H''34'' RETLW H''A4'' ;’2’
MOVWF DB0 RETLW H''B0'' ;’3’
MAIN: MOVF DB0,0 RETLW H''99'' ;’4’
CALL TABLE RETLW H''92'' ;’5’
MOVWF PORTSEG RETLW H''82'' ;’6’
MOVLW H''FE'' RETLW H''F8'' ;’7’
MOVWF PORTCA RETLW H''80'' ;’8’
CALL DELAY25 RETLW H''90'' ;’9’
BSF PORTCA,0 RETLW H''88'' ;’A’
; RETLW H''83'' ;’B’
SWAPF DB0,0 RETLW H''C6'' ;’C’
CALL TABLE RETLW H''A1'' ;’D’
MOVWF PORTSEG RETLW H''86'' ;’E’
MOVLW H''FD'' RETLW H''8E'' ;’F’
MOVWF PORTCA ;
CALL DELAY25 #INCLUDE <DELAY25.INC>
BSF PORTCA,1 END
范例二：7seg11.*
LIST P=16F877,R=DEC
#INCLUDE <P16F877.INC>
CBLOCK H''20''
ENDC
;
PORTSEG EQU PORTD
TRISEG EQU TRISD
PORTCA EQU PORTB
TRICA EQU TRISB
;
ORG 0
NOP
BANKSEL TRICA
MOVLW 0
MOVWF TRICA
MOVWF TRISEG
BANKSEL PORTCA
MOVLW 0XFF
MOVWF PORTCA
MAIN: MOVLW H''99''
MOVWF PORTSEG
MOVLW H''FE''
MOVWF PORTCA
CALL DELAY25
BSF PORTCA,0
;
MOVLW H''B0''
MOVWF PORTSEG
MOVLW H''FD''
MOVWF PORTCA
CALL DELAY25
BSF PORTCA,1
;
MOVLW H''A4''
MOVWF PORTSEG
MOVLW H''FB''
MOVWF PORTCA
CALL DELAY25
BSF PORTCA,2
;
MOVLW H''F9 MOVWF PORTSEG
MOVLW H''F7''
MOVWF PORTCA
CALL DELAY25
BSF PORTCA,3
GOTO MAIN
;
#INCLUDE <DELAY25.INC>
END
七段显示器显示0000～9999（自动加1）循环
范例一：7seg2.*
LIST P=16F877,R=DEC
#INCLUDE <P16F877.INC>
CBLOCK H''20''
R0,DB0,DB1
ENDC
;
PORTSEG EQU PORTD
TRISEG EQU TRISD
PORTCA EQU PORTB
TRICA EQU TRISB
;
ORG 0
NOP
BANKSEL TRICA
MOVLW 0
MOVWF TRICA
MOVWF TRISEG
BANKSEL PORTCA
MOVLW 0XFF
MOVWF PORTCA
ST: MOVLW 10
MOVWF R0
MOVLW 0
MOVWF DB0
MOVWF DB1
MAIN: MOVF DB0,0
CALL TABLE
MOVWF PORTSEG
MOVLW H''FE''
MOVWF PORTCA
CALL DELAY25
BSF PORTCA,0
;
SWAPF DB0,0
CALL TABLE
MOVWF PORTSEG
MOVLW H''FD''
MOVWF PORTCA
CALL DELAY25
MOVF DB1,0
ADDLW H''6''
BTFSS STATUS,1
GOTO MAIN
BCF STATUS,1
MOVF DB1,0
ANDLW H''F0''
ADDLW H''10''
MOVWF DB1
XORLW H''A0''
BTFSS STATUS,2
GOTO MAIN
GOTO ST
;
TABLE: ANDLW H''0F''
ADDWF PCL
T1: RETLW H''C0''
RETLW H''F9''
RETLW H''A4''
RETLW H''B0''
RETLW H''99''
RETLW H''92''
RETLW H''82''
RETLW H''F8''
RETLW H''80''
RETLW H''90''
;
#INCLUDE <DELAY25.INC>
END BSF PORTCA,1
;
MOVF DB1,0
CALL TABLE
MOVWF PORTSEG
MOVLW H''FB''
MOVWF PORTCA
CALL DELAY25
BSF PORTCA,2
;
SWAPF DB1,0
CALL TABLE
MOVWF PORTSEG
MOVLW H''F7''
MOVWF PORTCA
CALL DELAY25
BSF PORTCA,3
;
DECFSZ R0,1
GOTO MAIN
MOVLW 10
MOVWF R0
INCFSZ DB0,1
MOVF DB0,0
ADDLW H''6''
BTFSS STATUS,1
GOTO MAIN
BCF STATUS,1
MOVF DB0,0
ANDLW H''F0''
ADDLW H''10''
MOVWF DB0
XORLW H''A0''
BTFSS STATUS,2
GOTO MAIN
MOVLW 0
MOVWF DB0
INCFSZ DB1,1
范例二：7seg22.*
LIST P=16F877,R=DEC
#INCLUDE <P16F877.INC>
CBLOCK 0X20
R0,DB0,DB1
ENDC
;
PORTSEG EQU PORTD
TRISEG EQU TRISD
PORTCA EQU PORTB
TRICA EQU TRISB
;
ORG 0
NOP
BANKSEL TRICA
MOVLW 0
MOVWF TRICA
MOVWF TRISEG
BANKSEL PORTCA
MOVLW 0XFF
MOVWF PORTCA
ST: MOVLW 10
MOVWF R0
MOVLW 0
MOVWF DB0
MOVWF DB1
AGAIN: CALL FOURSEG
INCFSZ DB0,1
MOVF DB0,0
ADDLW H''6''
BTFSS STATUS,1
GOTO AGAIN
BCF STATUS,1
MOVF DB0,0
ANDLW H''F0''
ADDLW H''10''
MOVWF DB0
XORLW H''A0''
BTFSS STATUS,2
GOTO AGAIN
MOVLW 0
MOVWF DB0 |
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