Timer interrupt 16F1827

[Bruce]

Interrupts on these are easier than older 16F parts with the auto restore feature, but you need to make sure you're flipping the right bits to set everything up properly....

Try this.

ASM
  __config _CONFIG1, _FOSC_INTOSC & _WDTE_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _CPD_OFF & _BOREN_ON & _CLKOUTEN_OFF & _IESO_OFF & _FCMEN_OFF
  __config _CONFIG2, _PLLEN_OFF & _LVP_OFF & _STVREN_OFF
ENDASM
 
  DEFINE OSC 8
  DEFINE INTHAND Tmr1Int
 
  OSCCON= %01110000
 
  GOTO Init  ' jump over interrupt routine
 
  ASM
Tmr1Int
  ; retfie auto-restores w, status, bsr, fsr and pclath
  bcf   T1CON,TMR1ON ; stop timer 1
  bcf   PIR1,TMR1IF  ; clear over flow flag
  movlw 0xBF         ; load timer for 16,535 * 8 prescaler interrupt on 16 bit timer
  movwf TMR1H        ; load high byte
  movlw 0x69         
  movwf TMR1L        ; load low byte
  bsf   T1CON,TMR1ON ; re-enable timer 1
  movlw 0x01
  xorwf PORTB,f      ; toggle RB0
  retfie             ; Return from interrupt
ENDASM
 
Init:
  PORTB = 0
  TRISB = 0
  CM1CON0.7=0
  CM2CON0.7=0
  ANSELA = 0           ' all digital. A/D disabled
  ANSELB = 0
  PIR1 = 0             ' clear TMR1 int flag
  PIE1 = %00000001     ' TMR1 int enabled
  INTCON = %11000000   ' global & peripheral ints enabled
  T1CON = %00110001    ' TMR1 1:8 prescale, timer1 on
 
Main:
  HIGH 1
  PAUSE 1000
  LOW 1
  PAUSE 1000
  GOTO Main
 
  END

Then check out DT_INTS-14 v1.00