Re: Re: Wake up from sleep using RB0/INT

On Mon, 03 Nov 2003 10:00:14 -0000, "sstandfast"  wrote:

>>>I am new to both JAL and Microcontrollers and I have a question 
>>>about 
>>>using interrupts to wake the chip up from sleep mode.
>>>p.s.  In my haste I forgot to mention that I am using a PIC16F877 @ 
>>>20Mhz

>>--Forgive me for asking, but why?
>>--Do yo want to save batteries?

>No I am not trying to save batteries but as I am also powering 
>several high gain amplifiers with the same supply every little bit of 
>power I can filtch from the PIC when not needed will be that much 
>better.  I know that the PIC only consumes on the order of mA but 
>that can mean the difference between an amp clipping and reproducing 
>the audio signal without distortion.
A PIC 16F877 uses some 10mA @  20 MHz. 

You can lower that to uA's if you use a 32 kHz Xtal. Some PIC's can do that in
software, like the 16F819. This drops from 2mA @ 20 MHz to external to 30 uA @
32 Khz internal. 

But it might be easier to buy a bigger supply?