Remember that you do not have to do all your context save before your MOVLW 
xxx/MOVWF TMR1H pair.

Assumptions:
1: We 'know' that TMR1H is in bank zero. (Use the datasheet LUKE)
2: TMR1 is the only enabled interrupt (this condition has to be true or this
scheme certainly won't work because a TIMER1 interrupt could occur
while in the middle of handling another interrupt)

You only need to:

    movwf    SAVE_W                ; save W
    movf      STATUS,W             ; get and save
    movwf    SAVE_STATUS     ; ... status
    clrf         STATUS                  ; bank 0
    movlw    xxx                           ; reload value
    movwf    TMR1H                   ; jam it it
    bcf          PIR1,TMR1IF         ; ack the interrupt

    ... do whatever else you need, if you can avoid any goto's or calls
    ... you don't even have to save PCLATH

    movf        SAVE_STATUS,W
    movwf     STATUS
    swapf      SAVE_W,F
    swapf      SAVE_W,W
    retfie

Bob Ammerman
RAm Systems

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