Hi to all engineers.

I am using 16c71
I was working on small code  to change prescaler and
timer clock to internal or external using  RA4 with out bothering
higher or lower nibbles.
RB7 is  timer clock input
RB6,5,4 are prescaler inputs
timer switch can be 1 or 0  bit 5 in option register
prescaler switch can be

000
001
010
011
100
101
110
111

bit 0,1,2 in option registor

this is what I am thinking to do

BTFSC        PORTB,7            ; test timer clock switch
MOVLW      B'00010000'        ; if off  load this for ext
BTFSS        PORTB,7            ; test timer pin
MOVLW      B'00000000'        ; if  on  load this for int
MOVWF        TIMER_REG    ; save it here
BTFSS        PORTB,6            ; test 1 of  pre switch
ADDLW        .1                      ; if low add 1
BTFSS        PORTB,5            ; same as above
ADDLW        .1                      ;  /
BTFSS        PORTB,4            ;  /
ADDLW        .1                      ;  /
MOVWF        PRE_REG         ;  save prescaler here
ADDWF        TIMER_REG,F   ; add pre to timer
MOVWF        OPTION_REG   ; send it to option register

did I do it correctly?
is there better way of doing it.

Andre Abelian