> ; initialize interrupts
>        banksel  INTCON      ; Bank 0
>          movlw  b'10100000'
>          ;             1-------  (GIE)1=interrupts enabled
>          ;             -0------  (PEIE)1=enable peripheral interrupts
>          ;             --1-----  (T0IE)0=disable TMR0 overflow  
> interrupt      <- controls TMR0 effectively

Heinz,

INTCON,T0IE = 0 disables TMR0 interrupts. IE = 0 for any
interrupt source disables it. source As TMR0 has no off/on control
it will start generating interrupts as soons as T0IE and GIE are set

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