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'How convert 16c54 code to 16c84 code?'
1998\07\01@124249 by Amr Ahmed A.

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Hello

I have downloaded a SSAVI decoder that uses PIC16C54
i have 16C84 pic. and i want to convert PIC16C54 code to PIC16C84
How that?





Thanks,
AMR

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1998\07\01@124906 by John Bellini

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I think you can use it directly in the 16C84.  You only have to watch
for the bank bits to be set correctly (STATUS,RP0).
You usually run in problems with bank bits not set correctly and the
wrong registers end up being written too.

John Bellini


-----Original Message-----
From: Amr Ahmed A. [spam_OUTamr77TakeThisOuTspamHOTMAIL.COM]
Sent: Wednesday, July 01, 1998 9:42 AM
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
Subject: How convert 16c54 code to 16c84 code?


Hello

I have downloaded a SSAVI decoder that uses PIC16C54
i have 16C84 pic. and i want to convert PIC16C54 code to PIC16C84
How that?





Thanks,
AMR

______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com

1998\07\01@125714 by Paulo Soares

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On Wednesday, July 01, 1998 17:45, John
Bellini[SMTP:JBellinispamKILLspamSTATPOWER.COM] wrote:
> I think you can use it directly in the 16C84.  You only have to watch
> for the bank bits to be set correctly (STATUS,RP0).
> You usually run in problems with bank bits not set correctly and the
> wrong registers end up being written too.
>
> John Bellini
>
>
> {Original Message removed}

1998\07\01@191710 by TONY NIXON 54964

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There are a couple of things to watch out for when doing the
conversion.

The reset vector on the C(F) 84 = 000h. The C54 = 1FFh
The OPTION register has extra bits assigned. (6 and 7)
The STATUS register page select bits refer to RAM on the 84 and
on the C54 refer to ROM These are now assigned PCLATH, but are unused
on the 84
The FSR register is 8 bits wide in the 84 and on 5 wide in the
C54.
PortA has an extra bit (RA4)
PortB has pullups
RAM location 7h is unimplemented in the 84
The TRIS and OPTION instructions should be changed as per Microchips
mention of avoiding their use. These registers are addressable in the
84
There are extra instructions available in the 84.
Return, Retfie, Addlw, Sublw
ROM address 0004h is an Interrupt vector.
RTCC changed to TMR0 and shared with RA4.


Tony


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