Someone mentioned
SoundLoop:
...
incf OffsetL ; add 1 to data pointer
btfsc STATUS,C
incf OffsetH
but my little cheat sheet claims that `incf' only affects the Z bit, not the C bit.
Is my cheat sheet leaving something out ? Or is there a bug in this code ? Or am
I missing something ?
The heavy use of
Bob Ammerman of Ram Systems says:
given:
instead of:
I have used:
In the program where I use this, I consider PCLATH/PCLATU to be resources
usable _only_ in my interrupt handler. I use the above trick for code at
task level. This seems to work quite well. It saves me the requirement of
saving PCLATH in my interrupt handler (which is _very_ pressed for time).
I have _not_ seen the pattern of MOVFF somehow being interrupted in the middle.
Are you saying that the instruction is basically skipped when this happens
(ie: it doesn't execute before entering the interrupt and it doesn't execute
on return from the interrupt). I'd love more particulars here if possible.
Also, in regard to the LFSR instruction. As far as I know, all silicon currently
available is broken. Just say _no_ to the instruction. It is a shame, because
this would be a _very_ useful instruction.
What does the LONGC macro do ? Why would anyone ever want to use it ? I'm
missing the point.'
ON 20010521@11:34:30 AM at page:
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DAV-MP-E62a David A Cary added 'Says
The PIC 12C509 processor does not have the
SUBLW, ADDLW
instructions.
'
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ADV--A41 Andrew D. Vassallo edited the page
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JMN-EFP-786 James Newton edited the page
ON 20010530@9:39:38 AM at page:
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JMN-EFP-786 James Newton added 'change
'
ON 20010530@9:42:45 AM at page:
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JMN-EFP-786 James Newton edited the page
ON 20010530@12:49:35 PM at page:
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JMN-EFP-786 James Newton added 'archive reference
http://www.piclist.org/techref/postbot.asp?by=time&id=piclist\2001\05\30\140847a
PICList post "A table question." table lookups without the addwf pcl,f'
ON 20010530@1:00:32 PM at page:
http://www.piclist.com/techref/microchip/devprogs.htm
JMN-EFP-786 James Newton added 'See also:
http://www.wsu.edu/~jackdoll/jmon/
A useful little monitor program for the '877 from Jack Dollhausen'
ON 20010530@1:02:14 PM at page:
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JMN-EFP-786 James Newton edited the page
ON 20010530@1:04:41 PM at page:
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JMN-EFP-786 James Newton edited the page
btfsc STATUS,C ; also known as skpnc
elsewhere on this page looks OK, because they follow the ``addwf'' or ``addlw''
instructions, which do affect the carry bit.
--
David Cary
'
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DAV-MP-E62a David A Cary edited the pageConnection to host failed.
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ON 20010508@1:24:01 PM at page:
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DAV-MP-E62a David A Cary added 'Says
Here is a trick I use to avoid problems with PCLATH/PCLATU and interrupts
on 18C chips:
'
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JMN-EFP-786 James Newton added 'archive reference
http://www.piclist.org/techref/postbot.asp?by=time&id=piclist\2001\05\09\184425a
PICList post "Ultra Edit Config" for MPASM'
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JMN-EFP-786 James Newton added 'archive reference
http://www.piclist.org/techref/postbot.asp?by=time&id=piclist\1998\06\17\133056a
PICList post "code challenge - compact I2C eeprom code"'
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ON 20010521@11:19:29 AM at page:
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DAV-MP-E62a David A Cary added 'Questions:
Is there anything on page
http://piclist.org/techref/microchip/17inst.htm
that pages.htm doesn't say better ?
'
ON 20010521@11:23:08 AM at page:
http://piclist.org/techref/microchip/pages.htm
DAV-MP-E62a David A Cary added 'Says
link to
http://piclist.org/techref/microchip/instr/call.htm
which discusses jump tables, and CALL on 12-bit-core PIC.
'
ON 20010521@11:27:40 AM at page:
http://piclist.org/techref/microchip/17inst.htm
DAV-MP-E62a David A Cary added 'Questions:
rcall lookup_func
;align to page start if needed
lookup_func:
addwf PCL,F,A
retlw 1
retlw 2
;align to page start if needed
lookup_func:
rcall lookup_index
retlw 1
retlw 2
lookup_index:
addwf TOSL,F,A
return
; For large tables you can:
lookup_index:
addwf TOSL,F,A
btfsc STATUS,C
incf TOSH,F,A
return