Code:
@ DEVICE pic16F876              ' System Device	
@ DEVICE pic16F876, WDT_ON      ' Watchdog Timer
@ DEVICE pic16F876, PWRT_ON     ' Power-On Timer
@ DEVICE pic16F876, BOD_ON      ' Brown-Out Detect
@ DEVICE pic16F876, LVP_OFF     ' Low-Voltage Programming
@ DEVICE pic16F876, CPD_OFF     ' Data Memory Code Protect
@ DEVICE pic16F876, PROTECT_OFF ' Program Code Protection
@ DEVICE pic16F876, XT_OSC
ADCON1=7
ON INTERRUPT GOTO KESME
INTCON = %11110000 ' Tmr0 aktif 
OPTION_REG = %01010101'Pull up dirençleri İPTAL- Bölme oranı 1/64.

Define LCD_DREG      PORTC ' LCD data portunu belirle 
Define LCD_DBIT      4 ' 4 bit'lik veri yolu 
Define LCD_RSREG     PORTC ' LCD register seçme portunu belirle 
Define LCD_RSBIT     2 ' LCD register seçme bitini belirle 
Define LCD_EREG      PORTC ' LCD enable portunu belirle 
Define LCD_EBIT      3 ' LCD enable bitini belirle 
Define LCD_LINES     2 ' LCD'deki satir sayisi
trisb=%11111111
TRISC=%11111101


LCDK VAR BYTE
Z VAR BYTE
Led_isik VAR BYTE
SAYAC VAR BYTE
LCD_Led VAR PORTC.1 
'tmr0=0 
Lcdk=0
BASLA:
PAUSE 300
LCDOUT $FE,$80,"HI!"
LCDOUT $FE,$C0,"LCD BACK LIGHT CONT."
LCDOUT $FE,$94,"B.0 & TMR0"

DISABLE 
KESME: 
if INTCON.1=1 then 
z=1 
Led_isik=0 
SAYAC=0  
Lcdk=0 
endif 
if z=1 then 
if Lcdk=0 then 
LCD_Led=1 
Lcdk=1 
endif 
SAYAC=SAYAC+1 
if SAYAC=62 then 
SAYAC=0 
Led_isik= Led_isik +1 
endif 
if Led_isik=8 then 
LCD_LED=0 
Led_isik=0 
SAYAC=0 
Z=0 
Lcdk=0 
endif 
endif
RESUME 
ENABLE
END
Hi I want to control LCD B/L with B.0 and Tmr0 interrupts. But still some problems. I can't find it. Pls Help me !!