Microchip AN615

[sayzer]

I think that if you make one on your own using PBP, it would take less time compared to modifying AN615.


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[Acetronics2]

Hi, Shahid

Just have a look to listing lines 79 and 80

Values Hour_HD_Max to be changed from 2 to 1, and Hour_LD_Max to be changed from 4 to 2 ...

Note Interesting lines are 300 - 330 ...

that might work like that ...

No, no, no flowers ... thanks

Alain

[shahidali55]

Thanks Acetronics, i'll try that out.
But sayzer, i want to use a PIC16C54A. It does not have TMR0 interrupt.
I have to mux 4 displays, check 4 buttons and keep accurate time.
How can i keep track of time without the interrupt???
Is there a way to keep time accurately without using hardware interrupts and do the rest of the stuff in PBP???
I have made a clock using a F84 and TMR0 interrupt...
Now i want to do the same thing without the TMR0 interrupt in PBP...

[Acetronics2]

Hi, Shahid

You're so right not to move to other Pics ... I tried some times ago from a 16C54 to a 16F84 ... ( was a " Berliner clock " !!! )

Result was not that !!! The differences between program counters and adressing make things really tricky ... possible to do, but very high upon my Pic's knowledge !!!

One thing about your program, I didn't tell you anything about PM and AM ...

if you want to use the alarm function, you'll have to add a flag for that ... look carefully at the digit overflows section : there are lines where hours units are cleared after hours tenths overflow : just toggle your flag here !!!
Of course, add a flag check to digits check for alarm raising ...

Alain

[sayzer]

Ali,

I guess you are targeting a low cost solution by selecting PIC16C54.

Am I right?

Edit: Ok. I just found this in your other post.
"I dont want to spend too much cash on erasable PICs cause once i give away the projects the IC will never be erased again..."


In this case, are there any other factors that make you use this chip?


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[shahidali55]

Ya i need to make these circuits at a low cost...
Actually i am facing a major problem with chips that do not have a TMR0 interrupt (12C508A).
All the devices need to have a basic accurate clock running in the background.
How can a implement a hour minute clock on PICs which do not have the TMR0 interrupt (but have timer0) and do other stuff also without much interference from the clock routine?
Is there a way i can do it in PICBASIC PRO ???

[mister_e]

I never found a PIC with a accurate internal clock. It shift at least with temperature.

You can still skip the interrupt and use MPASM Stopwatch (or else) to trim your program timing using a simple loop.