please dont rip this site

Myke Predko says:

Yesterday, I needed snippets of code which which will increment/decrement the "w" register without affecting any of the other registers in a 12C508.

For Increment, I came up with:

  xorlw 0x0FF                ;  Get 1s Complement of Number
  addwf Reg, w             ;  w = Reg + (w^0x0FF)
  subwf Reg, w             ;  w = Reg + ((Reg + (w^0x0FF))^0x0FF) + 1
                                      ;  w = w + 1

and for Decrement:

  subwf Reg, w             ;  w = Reg + (2^0x0FF) + 1
  xorlw 0x0FF               ;  Get 1s Complement of Result
  addwf Reg, w             ;  w = w - 1

"Reg" can be any Register in the PICMicro which cannot change during the course of the three instructions (in the low-end PICMicros, this is any port other than the timer and I/O ports).


file: /Techref/microchip/12countw.htm, 1KB, , updated: 1999/6/22 09:49, local time: 2024/3/29 07:49,
TOP NEW HELP FIND: 
44.202.209.105:LOG IN

 ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF="http://techref.massmind.org/techref/microchip/12countw.htm"> microchip 12countw</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

 

Welcome to massmind.org!

 

Welcome to techref.massmind.org!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .