cascade Timers on pic 16f877 - Electronic Circuits Projects Diagrams Free

vheerdg · 31st October 2008, 07:57 PM

Can any one tell me how to cascade the timers to form a minute or hour timer I know how to activate them. Can anyone please help............. THANKS

**Nigel Goodwin** · 31st October 2008, 09:10 PM

Just use a timer to create a regular interrupt (timer2 is probably the easiest), say every 10mS, then increment counters in software every interrupt.

It's a standard technique, and has been for decades.

AtomSoft · 31st October 2008, 09:14 PM

Nigel i even forgot how to do it lol If i set a 10mS interrupt.. for 1 second i would have to

1000mS(1s) / 10mS Per Interrupt = 100 interrupts to count to 1 second right?

**Nigel Goodwin** · 31st October 2008, 09:17 PM

Quote:

Originally Posted by AtomSoft

Nigel i even forgot how to do it lol If i set a 10mS interrupt.. for 1 second i would have to

1000mS(1s) / 10mS Per Interrupt = 100 interrupts to count to 1 second right?

Yes, then at 1 second zero the 10mS counter and start counting up for the next second.

AtomSoft · 31st October 2008, 09:20 PM

oh ok cool had to make sure its still locked in my head

I seem to forget things when i dont use them.

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31st October 2008, 07:57 PM	#1 (permalink)
vheerdg	cascade Timers on pic 16f877 Can any one tell me how to cascade the timers to form a minute or hour timer I know how to activate them. Can anyone please help............. THANKS

31st October 2008, 09:10 PM	#2 (permalink)
Nigel Goodwin	Just use a timer to create a regular interrupt (timer2 is probably the easiest), say every 10mS, then increment counters in software every interrupt. It's a standard technique, and has been for decades. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

31st October 2008, 09:14 PM	#3 (permalink)
AtomSoft	Nigel i even forgot how to do it lol If i set a 10mS interrupt.. for 1 second i would have to 1000mS(1s) / 10mS Per Interrupt = 100 interrupts to count to 1 second right? __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v8 PDF My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

31st October 2008, 09:20 PM	#5 (permalink)
AtomSoft	oh ok cool had to make sure its still locked in my head I seem to forget things when i dont use them. __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v8 PDF My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics