> Could you please send me the code to do it the other way?

E&OE

PS best practice is to save and restore W and STATUS, as they will
probably be altered by the ISR. This could affect operation when you
return to the main code

Here's how to, from the 628 datasheet. Although note that BCF
STATUS,RP0 does not guarantee Bank0. banksel status_temp
is much better, if indeed Bank0 is where you assigned the temporary
storage to be in

So, have a couple of registers w_temp and status_temp in Bank0
RAM. Microchip's comments below are not clear or complete. You
may be in Bank1 when the ISR is entered, and so W may be stored
in completely the wrong RAM. Make sure W and STATUS are
being saved and recalled from the correct bank. Any bank, as long
as it's the right one and W and STATUS are as they were when
the main code was left

MOVWF W_TEMP ;copy W to temp register,
;could be in either bank
SWAPF STATUS,W ;swap status to be saved into W
BCF STATUS,RP0 ;change to bank 0 regardless
;of current bank
MOVWF STATUS_TEMP ;save status to bank 0
;register
:
: (ISR)
:
SWAPF STATUS_TEMP,W ;swap STATUS_TEMP register
;into W, sets bank to original
;state
MOVWF STATUS ;move W into STATUS register
SWAPF W_TEMP,F ;swap W_TEMP
SWAPF W_TEMP,W ;swap W_TEMP into W

Joe

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

;iinitialise IRQ counter

          movlw   -.75
          movwf   irqs

;ISR

irq      bcf     pir1,tmr1if    ;clear irq flag

          incfsz  irqs           ;increment, skip after 75 interrupts
          retfie                 ;exit

          movlw   -.75          ;re-initialise counter
          movwf   irqs

          movf    portb,w       ;read portb
          xorlw   b'00000001'   ;toggle portb,0
          movwf   portb         ;write portb

          retfie                 ;exit
--=20
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