start up too long issue

wynnet · Joined: 02 Dec 2003 Posts: 15

IC 18f452
I have two ICs identical part number and lot, identical program, download/programmed by one PICSTART Plus.

One IC starts up immediately.
The second one has about 11 to 12 seconds delay, (seconds not msec).
What do I do wrong?
May be I set some flag/bits wrong.
I use MPLab and Picstart and CCS to create my firmware.
I know that I do something wrong,
the IC runs OK/correctly after 10-12 seconds delay.
I can just remove the IC, but I also want to learn my mistake.

Haplo · Joined: 06 Sep 2003 Posts: 659 Location: Sydney, Australia

Are you using both ICs on the same board, or on different boards? And do you have any of these active:
Power-up timer
Oscillator Startup timer
Brown-out reset

One of your boards may have a problem with the power supply/crystal. This may keep the PIC in the reset state until all the power-up conditions are met.

wynnet · Joined: 02 Dec 2003 Posts: 15

I place IC on socket on the same board.

rnielsen · Joined: 23 Sep 2003 Posts: 852 Location: Utah

Bad PIC? Try using a third PIC and if it works fine, use the bad one take up space in your garbage can.

Ronald