cblock.....endc - Electronic Circuits Projects Diagrams Free

AZdave · 23rd January 2005, 03:35 PM

In Nigel's "PIC Tutorial One - LED's" he uses;

Code:

cblock     0x20
           count1
           counta
           countb
endc

Are each of these a defined register? Are they 8, 16 or how many bits wide?

For instance, if I define 'bucket' how many bits do I have that could be set/unset? Can the bits be manipulated like other registers?
Example using 8 bits

Code:

cblock     0x20
           bucket
endc

movlw     b'00000001'
movwf     bucket
rlf       bucket
bsf       bucket, 6

Would 'bucket' then be '01000010'?

**Nigel Goodwin** · 23rd January 2005, 06:38 PM

All PIC registers are 8 bit, so the section of my code you quoted allocates three 8 bit variables at GPR addresses 0x20, 0x21, 0x22. The cblock/endc is an assembler directive for allocating meomory, and is described in the MPASM helpfile.

Basically it's a simpler way to allocate GPR's, than allocating each one a seperate address.

AZdave · 23rd January 2005, 08:30 PM

Thanks for the reply Nigel.

The more I learn the more dangerous I get... watch out PIC's here I come. :lol:

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23rd January 2005, 03:35 PM	(permalink)
AZdave	cblock.....endc In Nigel's "PIC Tutorial One - LED's" he uses; Code: cblock 0x20 count1 counta countb endc Are each of these a defined register? Are they 8, 16 or how many bits wide? For instance, if I define 'bucket' how many bits do I have that could be set/unset? Can the bits be manipulated like other registers? Example using 8 bits Code: cblock 0x20 bucket endc movlw b'00000001' movwf bucket rlf bucket bsf bucket, 6 Would 'bucket' then be '01000010'? __________________ Dave Life may not be the party we hoped for, but while we are here we might as well dance.

23rd January 2005, 06:38 PM	(permalink)
Nigel Goodwin	All PIC registers are 8 bit, so the section of my code you quoted allocates three 8 bit variables at GPR addresses 0x20, 0x21, 0x22. The cblock/endc is an assembler directive for allocating meomory, and is described in the MPASM helpfile. Basically it's a simpler way to allocate GPR's, than allocating each one a seperate address. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

23rd January 2005, 08:30 PM	(permalink)
AZdave	Thanks for the reply Nigel. The more I learn the more dangerous I get... watch out PIC's here I come. :lol: __________________ Dave Life may not be the party we hoped for, but while we are here we might as well dance.