Software reset

[leonel]

There are any way to do a software reset, not an hardware reset?

[mister_e]

By software only ... no.... and yes.

If you connect one extra i/o to your MCLR pin... yes

[leonel]

What your saying is to connect, for example, porta.1 to MCLR pin and "write" porta.0 = 0 to make a software reset?!

[mister_e]

yep. just make sure your PORTA.1 is set to high or as input when you boot the pic and that's it.

EDIT: i don't know if it's working but i just read my 18F2320 datasheet about the STKPTR register. Probably you can set the stack register full and do few gosub to get a Stack Full Resets too. never tested it. i'll try this now and let you know.

[mister_e]

Mouhaha it's working

' program to perfom an software reset
' PIC18F2220
DEFINE LOADER_USED 1
DEFINE OSC 20

DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h
DEFINE HSER_BAUD 9600

loop var byte
begin:
STKPTR = 0 ' clear Stack resets bits
hserout ["software RESET",13,10]
start:
    for loop = 10 to 0 step -1
        hserout ["reset in ",dec loop,13,10]
        pause 1000
    next
    
    STKPTR = $FF ' full stack pointer
    
    gosub there
    
    pause 1000
    goto start
there:
     hserout ["I'm supposed to be die now ;o("]
     pause 1000
     gosub there2
     return
there2:
     hserout ["I'm supposed to be die now for the 2nd time ;o("]
     pause 1000
     gosub there3
     return
          
there3:
     hserout ["I'm supposed to be die now for the 3rd time ;o("]
     pause 1000
     return

it never jump to 'there' or 'there2' and for sure 'there3'
cool stuff!

[Darrel Taylor]

if you're using an 18F type pic, you can just use the reset command.

@ reset

if using a 16F,

asm
  clrf PCLATH
  goto 0
endasm


Darrel

[mister_e]

@ reset

yup... always read the whole datasheet.