This couldn't be more timely, I need a three byte counter in my current
project.  I had given this some thought already, but always needed a little
extra code to handle the high byte.

Good stuff!

Martin R. Green
elimar@bigfoot.com

----------
From:   Dmitry Kiryashov[SMTP:zews@AHA.RU]
Sent:   Monday, September 22, 1997 4:00 AM
To:     PICLIST@mitvma.mit.edu
Subject:        Multi-byte counter trick

Hello Piclister members !

I am sure that I am not first discover of this but it's greate !
PIC have nice ability to implement normal multi-byte counters .
Look at example below . (Let it will 3 byte incrementing)
---
        incfsz  low,f
         skpnz
        incfsz  medium,f
         skpnz
        incf    high,f
---
Last instruction is INCF not INCFSZ .
Execution time is always equal to 7 clocks !

So any n-byte inc/dec operation have execution time equal to: 1+(n-1)*3
And previous carry flag not corrupted .

WBR Dmitry.