code conversion 16c54 to work on 16f84

[mvs sarma]

Hai
i joined recently and new to PIC . I seek help to convert a "Clock Design Using Low Power/Cost Techniques" by John Day in his application note AN0615B of microchip. the program is available as CLK8.asm

this was designed for PIC16C54A
i tried to use it with minor changes with PIC16F84A as this chip is reprogrammable. i could not sucseed fully.

Can any one help me please , to translate the clk8.asm to be able to work on PIC16F84

thanks in advance

sarma

 

[mramos1]

Sarma,

You did not leave a link to clk8.asm or the two datasheets. That might save a person time that is willing to look at it. I am not up on the 16C54A.

Are you getting assembly errors? Are the pins 100% compatible on the two datasheets? What part is not working?

 

[Tarsil]

Hai
Can any one help me please , to translate the clk8.asm to be able to work on PIC16F84

thanks in advance

sarma

U realy want to use that design? I've seen a few clock designs baed on F84 uC. Realy cheap to.
**broken link removed**
**broken link removed**
http://www.thouters.be/PicChickenSkeleton
See those links (and use Google for more).
BTW...why don't u start with a 16F628? It's much better then 16F84, cheaper and pin for pin compatible with '84. U'l find a lot of prj on the net and u can make ALL 16F84 programs run on it with minor modification (Nigel Goodwin has a tutorial about that if i rem well). Also see this: http://finitesite.com/d3jsys/16F628.html

 

[mvs sarma]

Thanks mramos1

i am attaching the clk8.asm and microchip AN0615B and a modified clk8a.asm to this post. the asm files are zipped.

the chips are pin compatible and few software changes are required.

i dont get assembly errors

the circuit uses 4 sevensigment displays and the ic runs with 32.768 crystal.

in fact i intended using this in my car, and anxiously waiting for debugging.

Onething, John day's clk8.asm, as one of my gurus commented. is very very compact and optimal
regards
sarma

 

[mvs sarma]

thanks Tarsil
i had already assembled this one
yes i have seen the propeller clock and the related items

i have also seen a jal modified ver of An0615 clock with 16F84 and Mhz clock with dispalays complemented with CC version and provision for ICSP-- but JAL rather not acquainted

sarma

 

[Nigel Goodwin]

It should be fairly easy to convert from the 54 to the 84, as it's upwards compatible - but really it's going from one antique to another, you may as well use a modern PIC instead.

For a start alter the GPR addresses, the 54 starts far lower, also remove the reset address - even vaguely modern PIC's reset to 0x0000. Add the 'goto init' as the first line after the 'org 0x0000' - if using a modern PIC disable any unwanted hardware here as well.

The code itself is VERY basic, it uses no special facilities at all, and should port easily.