b1.asm

汇编程序(cygnal c8051f021)

$INCLUDE(C8051F020.INC)
BIT_COUNT DATA 07FH
TIMER     DATA 07EH
TIMER1    DATA 07DH
TEN       DATA 07CH
DATA_IN   DATA 020H
DATA_OUT  DATA 021H							
CLK BIT  P1.6
DAT BIT  P1.7
           ORG 0000H
					 JMP START
					 ORG 0100H
START:      mov   WDTCN, #0deh            ; disable watchdog timer
            mov   WDTCN, #0adh
            mov   OSCXCN, #67h            ; enable external crystal
                                          ; oscillator at 22.1184MHz

            clr   A                       ; wait at least 1ms 
            djnz  acc,$                  ;  wait ~512us
            djnz  acc,$                  ;  wait ~512us

osc_wait:                                 ; poll for XTLVLD-->1
            mov   a, OSCXCN
            jnb   acc.7, osc_wait
            orl   OSCICN, #08h            ; select external oscillator as 
                                          ; system clock source
            orl   OSCXCN, #80h            ; enable missing clock detector

CP1INIT: 	mov CPT1CN, #080h	  ; Comparator 1 Control Register
          mov A, #010h                   
					djnz ACC, $                    
					anl CPT1CN, #not(30h)
          mov EIP1, #040h
					MOV TIMER,#50
MOV XBR2,#044H
MOV P0MDOUT,#001H
DELAY0:  MOV TIMER1,#255
DELAY1:  DJNZ TIMER1,DELAY1
         DJNZ TIMER,DELAY0
         MOV DATA_OUT,#10100100B
				 CALL SEND
        MOV R0,#010H
				MOV R1,#00000000B
SCREEN: 
				MOV DATA_OUT,#11001000B
				CALL SEND
				MOV DATA_OUT,R1
				CALL SEND
				CALL DELAY1S
				MOV DATA_OUT,#10100001B
				ACALL SEND
			  INC R1
				
				
				DJNZ R0,SCREEN		
				MOV DATA_OUT,#10100100B
				CALL SEND
				JMP EXIT
SEND: MOV BIT_COUNT,#8         ;发送字符子程序
      ANL P5,#00H
      CALL LONG_DELAY
SEND_LOOP:MOV C,DATA_OUT.7
          MOV DAT,C
          SETB CLK
					MOV A,DATA_OUT
          RL A
          MOV DATA_OUT,A
          CALL SHORT_DELAY

          CLR CLK
          CALL SHORT_DELAY
          DJNZ BIT_COUNT,SEND_LOOP
          CLR DAT
          RET
LONG_DELAY:  MOV TIMER,#1000       ;延时约200US
DELAY_LOOP:  DJNZ TIMER,DELAY_LOOP
             RET
SHORT_DELAY: MOV TIMER,#100      ;延时约20US
SHORT_LP:    DJNZ TIMER,SHORT_LP
             RET
DELAY1S:	  MOV TIMER,#200          ;延时约1S 
DELAY10:    MOV TIMER1,#20
              
DELAY11:  	CLR A
						DJNZ ACC,$
						DJNZ ACC,$
							 
						DJNZ TIMER1,DELAY11
						DJNZ TIMER,DELAY10
            RET
EXIT:	JMP EXIT
	END