| Author |
Message |
simon
Guest
|
 Posted:
Thu Jan 06, 2005 8:10 pm Post subject:
PIC18F1320 and wake-up |
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Hello, can anyone help please?
I have code that executes on wake-up from a port interrupt with the CPU
clocked from the Internal oscillator block at 4 MHz. This works fine.
I've now got to add a function whereby every 15 minutes, the CPU wakes
to send a signal to a remote unit to say 'I'm still working' and then
revert to sleep. Low power consumption is a priority with this project.
The 16F684 (and others) have the Ultra Low-power Wake-up (ULPWU) module
and I know I can implement this function externally but having looked
through the data sheet I'm sure this can be done within the CPU, say,
using the SEC_IDLE mode.
Enlightenment would be most welcome.
Cheers,
Simon |
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Luhan Monat
Guest
|
| Posted:
Sat Jan 08, 2005 4:59 am Post subject:
Re: PIC18F1320 and wake-up |
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simon wrote:
| Quote: | Hello, can anyone help please?
I have code that executes on wake-up from a port interrupt with the CPU
clocked from the Internal oscillator block at 4 MHz. This works fine.
I've now got to add a function whereby every 15 minutes, the CPU wakes
to send a signal to a remote unit to say 'I'm still working' and then
revert to sleep. Low power consumption is a priority with this project.
The 16F684 (and others) have the Ultra Low-power Wake-up (ULPWU) module
and I know I can implement this function externally but having looked
through the data sheet I'm sure this can be done within the CPU, say,
using the SEC_IDLE mode.
Enlightenment would be most welcome.
Cheers,
Simon
Hi, |
I've done several projects like this that need to save power.
1) Set up with WDT for the longest time (about 2 seconds).
2) Wake up every 2 seconds and count time - if not done, go back to sleep.
3) When you get to your count. Do the job. Then go back to sleep.
--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm |
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simon
Guest
|
| Posted:
Mon Jan 10, 2005 2:00 pm Post subject:
Re: PIC18F1320 and wake-up |
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|
In message <MvEDd.15101$yW5.2222@fed1read02>, Luhan Monat <x@y.z> writes
| Quote: | simon wrote:
Hello, can anyone help please?
I have code that executes on wake-up from a port interrupt with the
CPU clocked from the Internal oscillator block at 4 MHz. This works
fine.
I've now got to add a function whereby every 15 minutes, the CPU
wakes to send a signal to a remote unit to say 'I'm still working'
and then revert to sleep. Low power consumption is a priority with
this project.
The 16F684 (and others) have the Ultra Low-power Wake-up (ULPWU)
module and I know I can implement this function externally but having
looked through the data sheet I'm sure this can be done within the
CPU, say, using the SEC_IDLE mode.
Enlightenment would be most welcome.
Cheers,
Simon
Hi,
I've done several projects like this that need to save power.
1) Set up with WDT for the longest time (about 2 seconds).
2) Wake up every 2 seconds and count time - if not done, go back to sleep.
3) When you get to your count. Do the job. Then go back to sleep.
|
Thanks,
Simon |
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