Problems with 12F675

[Darrel Taylor]

1 sleep / wake cycle ? still not causing sparks across my synapses, Is that OSC/4, Arbitrary countdown of WDT, something conjured using black cat bones and herbs? ...

1 sleep/wake cycle is the process of putting the PIC to sleep, and having it wake-up from one of many reasons.

If that reason is due to the WDT, it may be more like "Black DOG bones".
The WDT isn't very accurate in most PIC's. And it varies from one Family to another. But essentially it's the base period of the WDT, multiplied by the Prescaler.

AND IF WDT is not enabled, will it sleep forever waiting for an interrupt? And if so will that interrupt wake it up?

Yup! She'll pull a "Sleeping Beauty" until a Prince comes along for a kiss.

Available Princely possibilities are ...
From the Midrange Reference.



Also, Bruce pointed out that the datasheets recommend 1 NOP after @ SLEEP instead of 2.

Not sure why I thought it was two.
<br>

[Archangel]

<h1> THANK YOU ! </h1>
That is what I needed confirmation on.

[fratello]

Yes, it's work now !
@ DEVICE PIC12F675, intrc_osc_noclkout, wdt_ON, pwrt_on, mclr_off, bod_off
...
@ Sleep
...
GPIF=0
...
Thanks again to all for help ! @ Cheers !

[fratello]

Works...but don't sleep ! I measure the current and it is all the time about 3.5 mA. Based on "PICadilly 12F675", writen by Ian Burn, I try to re-re-redefine the code. But...even I made like in book, the current consumption it's 3.5 mA !
" @ DEVICE PIC12F675, intrc_osc_noclkout, wdt_OFF, pwrt_on, mclr_off, bod_off
....
IOCB= %00001100
INTCON.3=1
OPTIONS_REG.6=1
....
main:
...
INTCON.0=0
Pause 100
@SLEEP
Pause100
... "
I don't understand why do not work ! I remove the PIC from schematic, and the current consumption is about 2.5 mA; so, the 12F675 consume about 1 mA, all the time and never go to sleep with "less than 1 microamp" !

[Archangel]

Hi fratello,
Well you have taken this thread every which away, instead of making new threads for different projects, so we do not really know which schematic and code you are asking about, so only "General" statements can be applied here. First, you are chasing 1 ma out of 3.5 ma, is there any way to kill the 2.5 since it is the bigger portion? Secondly, I do not think you will ever see 1&micro;A, maybe wrong just my opinion. Just before @ SLEEP, I would try tristating the GPIO by TRISIO = 255, disable WPU and in your configs, shut off WDT, and disable MCLRE, you might switch to LP_OSC, to further reduce power. Read this thread, different chip but useful maybe:
http://www.picbasic.co.uk/forum/showthread.php?t=11325

[fratello]

Thanks for reply ! I use the schematic from post #1 and the code continuous improved in this thread. I made this changes on the last code posted by Mr.Darell. I say that I use this schematic on automobile ; I think every way to reduce the consumption it's necessary...or maybe the battery of my car give enough current, even I don't start the engine for a long period...It is not a verry big problem, but I want to understand the "mechanism" of the sleep procedure, and I am dissatisfied because, even I try all the variants, the obvious results are not present ! Just I try to make this project almost perfect and I really appreciate the support of all. Sorry if I disturb somebody...or if I became boring...

[Darrel Taylor]

fratello,

Have you changed anything?
I see you put the WDT back to OFF ... good.

Here's a picture of my breadoard of your circuit, in case you see something different.
Obviously, I'm using LED's instead of relays, but the rest should be the same.

When in SLEEP mode, I measure about 8 µA on my cheap DVM.

The only time it's not in sleep mode, an LED(relay) is ON, so that current is about 7 mA.



Here's the program I'm currently using.

[Archangel]

it is not a very big problem, but I want to understand the "mechanism" of the sleep procedure, and I am dissatisfied because, even I try all the variants, the obvious results are not present ! Just I try to make this project almost perfect and I really appreciate the support of all. Sorry if I disturb somebody...or if I became boring...

Ya, Me too . . . You are not disturbing, or boring me, I just need to be clear on what you are doing, so as to understand, the post about PICadilly confused me.