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em có viết chương trình bật led dùng ngắt ngoài.Nhưng khi em bấm nút led không sáng, portc không thây đổi mức logic.mong các anh xem giúp sai chỗ nào.
Code:
#include "p16F887.inc"
;CONFIG1
; __config 0xFFF7
__CONFIG _CONFIG1, _FOSC_EXTRC_CLKOUT & _WDTE_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _CPD_OFF & _BOREN_OFF & _IESO_OFF & _FCMEN_OFF & _LVP_OFF
;CONFIG2
; __config 0xFFFF
__CONFIG _CONFIG2, _BOR4V_BOR40V & _WRT_OFF
org 0x00
goto main
org 0x04
goto ctngat
;=================================================
;khai bao bien
cblock 0x20
vong1,vong2,W_SAVE,STAT_SV,PCH_SV,FSR_SV
ENDC
;==================================================
org 0x05
main ;----------chuong trinh chinh
bsf STATUS,RP0
movlw 0x01;RB0 la input
movwf TRISB
clrf TRISC
bsf OPTION_REG,6;ngat canh xuong
bcf STATUS,RP0
bcf PORTC,0
bsf INTCON,4
bsf INTCON,7
GOTO $
;=======================================
ctngat
;---------luu gia tri cac thanh ghi-------
movwf W_SAVE ;
swapf STATUS,w ;
clrf STATUS ;
MOVWF STAT_SV ; STAT_SV = swap_nibbles
MOVF PCLATH, W
MOVWF PCH_SV ; PCH_SV = PCLATH
clrf PCLATH
movf FSR,w
MOVWF FSR_SV ; FSR_SV = FSR
;---------------------------------------------
;
btfsc INTCON,INTF ;
goto ngat
goto thoat_ngat
ngat
bsf PORTC,0 ;bat led
call delay
bcf PORTC,0
bcf INTCON,1;
;------------------------------------------------
;-------------tra lai gia tri cho cac thanh ghi---------------
MOVF FSR_SV, W
MOVWF FSR ; FSR = FSR_SV
MOVF PCH_SV, W
MOVWF PCLATH ; PCLATH = PCH_SV
SWAPF STAT_SV, W
MOVWF STATUS ; STATUS = swap_nibbles
SWAPF W_SAVE,F
SWAPF W_SAVE, W ; W = swap
BSF INTCON, GIE
thoat_ngat
RETFIE
;=================================================
delay
movlw d'20'
movwf vong1
movlw d'3'
movwf vong2
decfsz vong1
goto $-1
decfsz vong2
goto $-3
return
end
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