Pic16f84a and pic16c54

[chillychintu]

can PIC16F84A BE USED IN PLACE OF PIC16C54...PLEASE REPLY SOON

 

[Nigel Goodwin]

Both are antiques, but even the long obselete F84 is a better chip than the C54 - it should be fairly easy to port a C54 program to the F84, or even better a modern replacement for the 84.

 

[Acetronics]

Hi,

Replacing a 16C54 by a 16F84 may not be "so easy" due to the stack and program counter width ... ( ahaaaaaa ...)

Much better use a newer 16F54 ... especially raised for compatibility ...

Alain

 

[Nigel Goodwin]

Hi,

Replacing a 16C54 by a 16F84 may not be "so easy" due to the stack and program counter width ... ( ahaaaaaa ...)

No problem at all, as the 14 bit series are upwards compatible - the other way would be VERY different though.

 

[Acetronics]

No problem at all, as the 14 bit series are upwards compatible - the other way would be VERY different though.

Hi, Nigel

I have here a nice old DCF project from elektor ( Berliner Uhr ) for you to translate, if you want ...

Dozens of "not too bad" programmers have quitted ... but the original works fine !!!

I join it for the game ...

Alain

 

[Nigel Goodwin]

Really it depends what doesn't work, and it makes life somewhat more difficult with the comments been in German.

So where do problems arise?.

 

[chillychintu]

Thank you all for your replies

 

[Acetronics]

Hi, Nigel

Problems arise with the subs addressing ... as the Stack is only 2 level deep, programmer used nice tricks ... and when porting to a wider PC chip ... bits truncature ( I suppose ) used are no more truncated ...
so addressing becomes false ...

from there to fine running, no one found the right way ... to that day ...

Alain