PIC單片機的4*4鍵盤程序實例

時間：2012-06-23 23:07:19

關鍵字：鍵盤程序 PIC單片機 BSP OV

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[導讀];-------4*4鍵盤程序的使用-------- PC EQU 2 STATUS EQU 3 RA EQU 5 RB EQU 6 RC EQU 7 BIJIAO EQU 0F JIANZHI EQU 8 BUFFER EQ

;-------4*4鍵盤程序的使用--------
PC       EQU    2
STATUS   EQU    3
RA       EQU    5
RB       EQU    6
RC       EQU    7
BIJIAO   EQU    0F
JIANZHI EQU    8
BUFFER   EQU    9
BUFFER1 EQU    0AH
BUFFER2 EQU    0BH
COUNTER EQU    0CH
CON1     EQU    0DH
CON2     EQU    0EH
PIC57    EQU    7FFH
Z        EQU    2
;-----------------------------
         ORG    PIC57
         GOTO   MAIN
;-----------------------------
         ORG    0
;-----------------------------
;        延時子程序
;----------------------------
DELAY    MOVLW D'100'
         MOVWF CON1
L1       MOVLW D'200'
         MOVWF CON2
L2       DECFSZ CON2,1
         GOTO   L2
         DECFSZ CON1,1
         GOTO   L1
         RETLW 0
;-----------------------------
;        4*4鍵盤掃描判斷子程序
;-----------------------------
SCANKEY
         MOVLW B'11101111'
         MOVWF RB
         MOVF   RB,W
         ANDLW B'00001111'
         MOVWF BUFFER
         MOVLW B'00001111'
         XORWF BUFFER,W
         SKPNZ
         GOTO   XYB1
         MOVWF BUFFER1
         MOVLW 1
         MOVWF JIANZHI
         MOVF   RB,W
         MOVWF BIJIAO
         GOTO   QJZ

XYB1     MOVLW B'11011111'
         MOVWF RB
         MOVF   RB,W
         ANDLW B'00001111'
         MOVWF BUFFER
         MOVLW B'00001111'
         XORWF BUFFER,W
         SKPNZ
         GOTO   XYB2
         MOVWF BUFFER1
         MOVLW 5
         MOVWF JIANZHI
         GOTO   QJZ

XYB2     MOVLW B'10111111'
         MOVWF RB
         MOVF   RB,W
         ANDLW B'00001111'
         MOVWF BUFFER
         MOVLW B'00001111'
         XORWF BUFFER,W