Since I'm not familiar with the assembler you are using, I may get some things wrong.


PCA_INTERRUPT:
CLR CCF0

PUSH ACC
PUSH PSW
PUSH DPH
PUSH DPL
PUSH B
;
; ***need to find out which waythe .DCW stores the high and low
; bytes into memory. This will affect the following code
;
mov a,reload_index
clr c
rl a
mov dptr,#reload_table
movc a,@a+dptr ;get low byte
mov b,a ;save low into B

mov a,reload_index
clr c
rl a
inc a ;+1
movc a,@a+dptr ;get high byte

xch a,b ;swap hi and low values
;
; add reload value to the capture register
;***need to read the datasheet to see if the
; capture registers need to be read and written in a particular
; order**** this might be critical
;
add a,CCAP0L
mov CCAP0L,a
mov a,b
addc a,CCAP0H
mov CCAP0H,a

djnz pulse_count,isr_1 ;count pulses

mov pulse_count,#100 ;reload
inc reload_index ;next frequency reload
;
; add test for reload_index rollover
;

isr_1: ;berenkat!
POP B
POP DPL
POP DPH
POP PSW
POP ACC
RETI


The above code is only a suggestion - it is not necessarily correct! However, it might give you some ideas. also, please don't think I'm an expert with the PCA - I last used it 16 years ago!

Salamut jalan!