Josh, this has been an interesting topic. Looking back over the data book,
it appears that you can wakeup from SLEEP by just setting the related enable
Bit (EEIE in this case). If GIE is cleared, execution will continue right
after the SLEEP and will not jump to the IRQ address. Since I normally use
interrupts for other things I was not aware of this alternative. Note, you
still need to clear the Flag Bit (EEIF) after you wakeup. So regarding my
earlier remarks, "nevermind" ;-)

   - Tom

At 11:56 AM 4/17/00 -0500, Josh Koffman wrote:
>Tom Handley wrote:
>
>>    Josh, the example code on page 43 works exactly as described but they
>> don't provide the whole picture as far as the SLEEP Interrupt. If you do
not
>> want to use interrupts, you can simply replace SLEEP with a 10ms (or
longer)
>> delay. However, the most efficient and reliable method is the one they
>> describe. Execution is resumed right after the SLEEP interrupt.
>>
>>    You need to do the following:
>>
>>       1. Set INTCON Bit 6 to enable Peripheral Interrupts.
>>       2. Set PIE2 Bit 4 (EEIE) to Enable "EEPROM Write Operation
Interrupt".
>>          Note, this register is in bank 1 (RP1 = 0, RP0 = 1).
>>
>>    In your Interrupt Handler, look for PIR2 Bit 4 (EEIF) which is the
>> "Write Operation Interrupt" flag Bit. As with most interrupt flags, you
>> need to clear the Bit. Note, PIR2 is in bank 0 (RP1 = 0, RP0 = 0).
>>
>>    That's it. Works fine, everytime...
>>
>>    - Tom
>
>Tom,
>Thank you for the response. My original intention was to avoid using the
>interrupt handler. I'm not using interrupts elsewhere in my application,
and the
>handler would have basically just cleared the interrupt flag, then RETFIE. I
>thought this was somewhat of a waste. I got another response, and I'm pretty
>sure what I can do is enable peripheral interrupts, enable the EEPROM
interrupts
>(EEIE), but leave GIE disabled. When I put the microcontroller to sleep,
and the
>write completes, the interrupt will wake the controller up, but not cause
it to
>vector to 0x04. Am I correct in saying this will happen?
>
>Thanks for all your help!
>
>Josh Koffman
>joshy@mb.sympatico.ca

------------------------------------------------------------------------
Tom Handley
New Age Communications
Since '75 before "New Age" and no one around here is waiting for UFOs ;-)