RE: Item 1) You're right.

RE: Item 2) I have to turn global interrupts off when I get
ready for a long call with the 17C756.  That's real world.
I'm just starting the coding for 16F87x and had my suspicions
that I would have to turn them off when I do a long call.
Guess we'll see, huh?

RE: Item 3) This sounds very strange.  But after rereading it
a bit, it sure makes sense.

Thanks and GL,
Walt...

-----Original Message-----
From: John Gerthoffer [mailto:jgerthoffer@AAMATRIX.COM]
Sent: Monday, April 17, 2000 2:06 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: Page Limit?


I have recently been trying to test my code for page boundary effects.

What I have found is
1) If you CALL or GOTO, make sure PCLATH is set correctly.
  (pagesel routine_name or
   movlw HIGH routine_name, movwf PCLATH).  And reset PCLATH after a CALL.
2) I had to disable interrupts while operating on PCLATH.  An interrupt
completely screws up the program  the simulator.  In real life, who knows???
3) When stuffing PCLATH and PCL to create a program branch, check for 0x100
boundary crossing. (not just page boundary).  Increment PCLATH by 1 if an
offset branch rolls PCL over (FFh -> 00h).

Food for thought.


Regards,

John Gerthoffer
American Auto-Matrix
Export, PA

-----Original Message-----
From: Kieran Miller [mailto:kiermill@DTN.NTL.COM]
Sent: Saturday, April 15, 2000 12:48 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Page Limit?


Hi,

I'm merrily writing code for my PIC 16F874 - and the program size is
increasing fast. What happens when I reach a page boundary? Do I need to do
something with PCLATH, or will the assembler flag a warning or do whatever
is necessary for me?

Thanks for your help,

Kieran

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