org  00h ;goto a1;org  0ch;;******************************************;   主程序段;******************************************a1  movlw  8;循環(huán)次數(shù) movwf  40h;movlw  B01111111;初顯示值movwf  41h;a2   bsf   STATUS,RP0;選擇體1bcf   STATUS,RP1;movlw  00h;movwf  TRISD;設(shè)置RD口為輸出口bcf   STATUS,RP0;選擇體0bcf   STATUS,RP1;movfw  41h;movwf  PORTD;輸出顯示數(shù)據(jù)RRF   41H,0;處理Crrf   41h,1;循環(huán)右移call  m001;延時(shí)decfsz  40h,1;判斷是否完成8次goto  a2;否繼續(xù)goto  a1;是返回重新設(shè)置;************************************************;   延時(shí)子程序;************************************************m001movlw  4movwf  30hm002  movlw  248movwf  31hm003  movlw  250movwf  32hdecfsz  32h,1goto  $-1decfsz  31h,1goto  m003decfsz  30h,1goto  m002    returnend