I think you need a number of 256 value tables and then
"call table1", "call table2" and so on depending on
the actual number in "overflow".        Each table taking
care of one 256 byte sequence each.

Another thing, do use the pre-defined symbols for
the flags in the SFRs, like "bcf intcon, t0ie"
instead of "bcf intcon, 2".
The code is much easier to read that way.

Another different solution to this problem would
be to store the full "table" in some external memory
like a serial EEPROM. The value in "overflow" would
then just be the address bits 8 and 9. Address bits
0 to 7 would of course be the final tmr0 value. That
way it would also be easier to update the table in the
field, if needed.

And, a big *AND*, it's tmr0, not tmro !!

Jan-Erik.


-----Original Message-----
From: Kevinhoward@AOL.COM [mailto:Kevinhoward@AOL.COM]
Sent: den 27 juli 2003 20:30
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]:16bit timer and large lookup table 16f62x


Hi,

       Using tmro sounds easier but I haven't worked out how to actually add
how many times tmro has overflowed ff's to the table-(as you will have guessed
I am still on the learning curve!!!)

If I used TMRO;

p1       btfsc     pulse1               ;start
          goto       p1
          clrf        tmro
          bcf        intcon,2           ;clear tmro and intcon,2

p2       btfsc     intcon,2
           call      oflowcount           ;stores nuber of times tmro has
overflowed
           btfsc    pulse2              ;end time
           goto     p2
           movf     tmro,w
           movwf  time              ;tmro value now stored in time

workout
          movf       time,w              ;tmro value
          call        table1
          movwf     timedelay           ;tmro value now stored in time delay
          goto        rest of program

oflowcount
       btfss     intcon,2
       return
       incf       overflow          ;number of times tmro has overflowed
stored here
       bcf       intcon,2
       return

;how can I add number of ff rollovers as stored in overflow to the table?

table1                      ;750-1000 lines
       addwf   pcl,f
       retlw     .
       retlw     .
;etc

Thanks again

Kev


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