Working clock example using 32K watch crystal

[Ioannis]

How about using 3 If-Then's insead of one with 3 OR's?

Ioannis

[pedja089]

I spent all night trying to find the best way ... I think this is

              If month=2 then
                 If year//4<>0 then
                    DMonth=29
                 else
                    DMonth=28
                 endif
              else
              Dmonth=30+month.0 
              endif   
              If day>Dmonth then
@                CLRF _Day
@                INCF _Month,F
                 If month>12 then

And everywhere there is any = 0, I replaced the @ clrf, +1 replaced with @ incf.
The end result was the RTC which consumes about 2uA and code size about 500B.

[Ioannis]

I think you have to change the <>0 to =0 when you test for the modulo 4.

A better solution to cover more years (you code will not cover year 2100) is to use mod 400, mod 100 and mod 4 to test for leap year (mod 100 is NOT leap year, while 400 and 4 ARE leap years).

Of course we may not live in year 2100, but just in case...

Now about the @ commands, just be sure you are on page 0. Else you have to check the page bits. Or put this subroutine on top of your code.

Ioannis

[pedja089]

Thanks for that... It was just typo... 0-99 year is fine for this aplication.
On the top of ISR I have BSR=0, and isr routine is on top of my programm.

[Ioannis]

If I may suggest, make the minutes and hours update in your main loop and not in Interrupt. A temp variable wll be needed for this.

Ioannis

[pedja089]

If pic loses power, it goes to sleep. And everything is shut off, only tmr1 is on. So i need that in ISR. Is there better way?