please dont rip this site

SX Embedded Controller Instruction

CC

Description: Complement carry
Operation: -
Flags affected: C, DC
Registers affected: Status
Sources referenced: Status
Cycles: 1
Opcode:
Actually compiles to: CLRB 3.1 ; INCSZ 3
Microchip PIC syntax:
Notes:

This is a trick to complement the Carry flag that takes advantage of the fact that Carry is the lowest order bit in the status register. You can always switch a zero to a one or a one to a zero by adding one to it. As long as the (little used) DC flag is cleared, incrementing the Status register wil never effect any higher bits such as Z or PA0..2. Using the INCSZ rather than a regular INC keeps the Z flag from being affected. Since the DC was 0 before the INCSZ, there is no way the skip can occur.

To use this instruction, first define the following macro.

CC macro
 CLRB 3.1
 INCSZ 3
 endm

See also:


file: /Techref/scenix/inst/cc.htm, 2KB, , updated: 2004/12/13 17:38, local time: 2017/11/18 13:07,
TOP NEW HELP FIND: 
54.80.33.183:LOG IN

 ©2017 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/scenix/inst/cc.htm"> SX Instruction CC </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 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!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .