Design of single chip flashing light-EEWORLD

Collect

;********************************************************
;* This program is a LED light cycle flashing program, use the INT key to switch*
;* Flashing mode*www.dangdangdz.com
;********************************************************
include
;*----
MODESEL equ 20h
MODESELB equ 21h
Count equ 22h
Count1 equ 23h
Count2 equ 24h
PORTDB equ 25h

;*-----

org 0
goto start
org 4
goto ISR

org 10
start
clrf PORTD ; clear port D
movlw 00h
movwf MODESEL ; initialize mode select register
movwf MODESELB
movlw b\'10010000\'
movwf INTCON ; initialize interrupt control
bsf STATUS,RP0
clrf TRISD ; set port D to output
movlw b\'10111111\'
OPTION ; select INT falling edge to be valid

bcf STATUS,RP0
call FMsel
movwf PORTDB
movwf PORTD
main btfsc PORTB,0 ;
goto $+6 ;
call Delay ; key debounce
btfsc PORTB,0
goto $+3 ; /
call FMsel ;/
movwf PORTDB
movf MODESELB,W ;
movwf MODESEL ;
call LongDelay
bcf STATUS,C
rlf PORTDB,1
btfsc STATUS,C
bsf PORTDB,0
movf PORTDB,W
movwf PORTD
goto main

;*----------
Delay ; call instruction takes 2 instruction cycles
clrf Count ; clear Count takes 1 instruction cycle
Dloop
decfsz Count,f ; these two lines of instructions will delay
goto Dloop ; (256 * 3) -1 instruction cycle
return ; return takes 2 instruction cycles

;*----------------
LongDelay
clrf Count
clrf Count1
movlw 0x01
movwf Count2
LDloop
decfsz Count,f
goto LDloop
decfsz Count1,f
goto LDloop
decfsz Count2,f
goto LDloop
return

[page]

;*---------------
FMsel
movf MODESEL,w
movwf MODESELB
movf MODESEL,w
addwf PCL
retlw b\'11111000\'
retlw b\'11110000\'
retlw b\'11100000\ '
retlw b\'11000000\'
retlw b\'10000000\'
movlw 00h
movwf MODESELB
bsf INTCON,GIE
retlw b\'11111000\'
return

;*-------------
ISR
btfss INTCON,INTF
goto $+3
bcf INTCON,INTF
incf MODESEL
retfie
end

Programming method of single chip microcomputer controlling LED light flashing

1: Program start (START)

2: A=00000000B

3: PORT 0

4: Delay (DELAY)

5: A=11111111B

6: PORT 0

7: Delay

8: Back to the beginning

Delay subroutine programming method:

1: R6=0

2:DEL1

3: R7=0

4: $

5: R7-1

6: R7=0 is not equal to 0, return 2

7: R6-1

8: R6=0 is not equal to 0, return 4

Return to the main program

Keywords：MCU Reference address：Design of single chip flashing light

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