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RTC (view source)

Revision as of 20:51, 16 February 2009

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====Turning on IRQ 8====
To turn on the periodic interuptinterrupt, all you have to do is:
<pre>
disable_ints(); //disable interrupts include NMI
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====Changing Interrupt Rate====
Changing the output divider changes the interrupt rate, *without* interferringinterfering with the RTC's ability to keep proper time. The lower 4 bits of register A are the interrupt divider. The default is 0110b, or 6. The frequency must be a value from 1 to 15. A value of 0 disables the interrupt. To calculate a new frequency, you would do
<pre>
frequency = 32768 >> (rate-1);
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