74HC595 revolving lantern demonstration program-EEWORLD

Collect

;================================================

SDATA_595 EQU P1.0; Serial data input

SCLK_595 EQU P1.1; shift clock pulse

RCK_595 EQU P1.2; Output latch control pulse

;================================================

ORG 0000H

LJMP MAIN

ORG 0030H

;================================================

MAIN:

MOV SP,#60H

MOV R0,#0FEH

MAIN1:

CALL OUT_595

CALL DELAY

MOV A,R0

RL A

MOV R0,A

JMP MAIN1

;---------------------------------------------------------------

;Output latch output data subroutine

;---------------------------------------------------------------

OUT_595:

LCALL WR_595

CLR RCK_595

NOP

SETB RCK_595; rising edge sends data to output latch

NOP

CLR RCK_595

RIGHT

;--------------------------------------------------------------

;Shift register receiving data subroutine

;--------------------------------------------------------------

WR_595:

MOV R4,#08H

MOV A,R0

WR_LOOP:

RLC A

MOV SDATA_595,C

SETB SCLK_595; Shift occurs on rising edge

NOP

CLR SCLK_595

DJNZ R4,WR_LOOP

RIGHT

;--------------------------------------------------------------

;Delay subroutine

;--------------------------------------------------------------

DELAY:

MOV R5,#03H

DEL0:

MOV R6,#0FFH

PART 1:

MOV R7,#0FFH

DJNZ R7,$

DJNZ R6,DEL1

DJNZ R5,DEL0

RIGHT

;---------------------------------------------------------------

END

Keywords：74HC595 Reference address：74HC595 revolving lantern demonstration program

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