PIC 12F509 begins to heat at power up

[Pedro Pinto]

Hello ErnieM

I not preset GPIO before TRIS, i make only a alias from the pins before TRISIO

Attached the schematic

Regards
Pedro

[Archangel]

I not preset GPIO before TRIS, i make only a alias from the pins before TRISIO
Pedro

Hi Pedro,
That was the point, that you should, so when TRIS makes the port an output it does so in a state chosen by YOU, not the devil.

[Pedro Pinto]

Hello Joe S.

English is not my natural language, sorry i not understand very well what
you mean in your answer. Is anything wrong in this code?

DEFINE OSCCAL_2K 1
'
sepic_ok var GPIO.3        
call_shutdown var GPIO.4
sepic_on_off var GPIO.5
pulsador var GPIO.2
am_on_off var GPIO.1
'sense var GPIO.0
'
TRISIO = %11001111
'
low sepic_on_off        
low call_shutdown       
'						
ciclo var word
conta var byte 
conta2 var byte
flag_pulsador var byte

Do you think that i must change it? if yes, what?

Thanks
Best regards
Pedro

[Archangel]

Hello Joe S.

English is not my natural language, sorry i not understand very well what
you mean in your answer. Is anything wrong in this code?
Pedro

Hi Pedro,
I have not time to check data sheets, it's WorkTime , but check what I did below, the comment in blue is because I have not checked the data sheet.

DEFINE OSCCAL_2K 1<font color=blue> 'is this correct? </font color>
'
sepic_ok var GPIO.3        
call_shutdown var GPIO.4
sepic_on_off var GPIO.5
pulsador var GPIO.2
am_on_off var GPIO.1
'sense var GPIO.0
'
GPIO = %00000000 '<font color=red>change to suit Your needs</font color>
TRISIO = %11001111
'
low sepic_on_off        
low call_shutdown       
'						
ciclo var word
conta var byte 
conta2 var byte
flag_pulsador var byte

[ruijc]

Greetings Pedro,

I think that the idea is to set the pin state before the tris:

GPIO=%01010101 ( either high or low )

PS. tens de definir o estado inicial dos portos ( altos ou baixos ) antes de definires o trisio

PS2. - Like Joe said

Regards

[Pedro Pinto]

Hello

Thanks, i will try it. That is the first and unique project where i use a 8 pin PIC
The 12F509 have Flash Program Memory of 1.5 kBytes
The 12F508 have Flash Program Memory of 0.5 kBytes
Therfore i think that is correct - DEFINE OSCCAL_2K 1 - I hope i'm not wrong

The datasheet says - On Reset ALL pins are input.
I will test with GPIO = %00000000 and after that to set the
TRISIO = %11001111

I notice if i have success with this changes

Thanks All

Best Regards
Pedro

Para o Rui, quando estiveres o MSN, falamos

[Archangel]

Hello

Thanks, i will try it. That is the first and unique project where i use a 8 pin PIC
The 12F509 have Flash Program Memory of 1.5 kBytes
The 12F508 have Flash Program Memory of 0.5 kBytes
Therfore i think that is correct - DEFINE OSCCAL_2K 1 - I hope i'm not wrong

The datasheet says - On Reset ALL pins are input.
I will test with GPIO = %00000000 and after that to set the
TRISIO = %11001111

I notice if i have success with this changes

Thanks All

Best Regards
Pedro

Para o Rui, quando estiveres o MSN, falamos

I think you should have
DEFINE OSC 4
in your code. I have never seen OSSCAL done as a define before, I
do not see why not, but I have only seen it done as so:
OSCCAL = %0000000
or
OSCCAL = $00

ANYBODY want to give a short treatise on this ?