Permanent sleep

[Ron Marcus]

Heuuu

No GIE = No Sleep ( RTFDatasheet ... $ 14.8.1 - Greyed Note ), so we set GIE Bit

Then ... Executes the 1St NOP

Then ... Branches to location 0004 ...

But there is a supposed Interrupt stubb here instead of falling into the "program" ...

a single " DEFINE INTHAND INIT " without any interrupt stubb ( LOL ! ) would push the libs away from the 4 first program locations ... and allow restarting the PIC as a first power up ...

We could also Branch to the "Pause 100" ... to have some visual effect before re-entering sleep ... ( wich is better ...I think)

Sooo ...

we add :

DEFINE INTHAND _BLINK ' near top of program

and

BLINK:

Before

Pause 100 ' Needed for system Wake-Up
HIGH LED : PAUSE 200 : LOW LED
GOTO CYCLE




I am right, Mel ???

Alain

I am using the '690. In that FM, the processor will still wake from sleep if the flag is set without the GIE set. With the GIE set you have to service the interrupt. Without, it starts up right after the sleep command.

Ron

[Acetronics2]

Hi Ron,

You're perfectly right with the '690 ... but, care ... GIE settings do not have the same effects for the '628 ... and GIE *must* be set to enter sleep ( sleep ignored if GIE = 0 ) .

Alain

[Ron Marcus]

Hi Ron,

You're perfectly right with the '690 ... but, care ... GIE settings do not have the same effects for the '628 ... and GIE *must* be set to enter sleep ( sleep ignored if GIE = 0 ) .

Alain

I did check the '628 book and you are correct sir! I reread it twice to catch it.
Ron

[Acetronics2]

Hi, Charudatt

Do not worry !!! This is certainly one of the least documented feature of PBP ...

DEFINE INTHAND _INTER ...

1) keeps prog mem locations 2 and 3 free ...

2) places a GOTO _INTER at location 4 ... or a bit further if more than 1 program page ...and COULD need context saving.
_INTER ( Note the Leading Underscore ) is the PBP "INTER:" Label readable by Assembler ...

Consider it as a "classical" GOTO ... but you reach it when an "interrupt reason" occurs ... no latency then.

INIT (Without Underscore !!! ) is the first ASSEMBLER line your Program really executes at power ON ...

So, as is ... you can i.e. restart your PIC, ... without using MCLR - if not disposable !!!
... or goto the label you want !!!

Alain

[Ron Marcus]

Allain,
I was right. Clearing GIE does work as it does on the '690. It will wake and continue without needing an interrupt handler.

Ron

[mister_e]

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[Acetronics2]

Allain,
I was right. Clearing GIE does work as it does on the '690. It will wake and continue without needing an interrupt handler.

Ron

What about ENTERING sleep ??? 628A datasheet clearly says IF GIE = 0 , the SLEEP command is treated as a NOP ...

I'm a bit confused here ... or I do not have the latest datasheet !!!

Alain

[Ron Marcus]

The little window says if GIE is 0 and both the flag bit and enable bit are set, it will treat the sleep command as a nop. If the flag bit is cleared, it will sleep. It IS confusingly written!

[charudatt]

Hello Ron and Other,

I did not understand the Int_handler part. You mean to say , declare a Int_handler without a lable and make the pic reset.

Well setting GIE made it to go to sleep (LED not blinking but current 6mA) but did not come out of it.

any further help?

regards