Low-voltage PIC 18LF4550

pasini · Joined: 12 Dec 2005 Posts: 50 Location: Curitiba - Brazil

I have a low-voltage PIC18LF4550 supposed to run at 3.3V. I cannot compile and communicated with ICD2 when it is connected.
Is there any restriction due to the low-voltage ?

Do I have to create another component for the 18LF4550 or can I use the standard 18F4550.h library ?

Can the board burn because of the 5V from the ICD2 ?

What differences are there when programming this low-voltage device ?

Thanks in advance
Pasini

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

If your board is running at +3.3v, you should not try to power the board
from the ICD2. You should disable that option. The board should
supply its own power (from a battery, or a wall transformer, etc.).

To configure the board to run from its own power, go to the Programmer
menu in MPLAB and select Settings. Then in the pop-up dialog, select
the Power tab. On that tab you'll see a checkbox for "Power target
circuit from MPLAB ICD2 (5v Vdd). Un-check that box. Click "Apply",
and then exit from the menu. Then go to the Programmer menu
and select Connect. After you do this, you should go back to that
same menu again and verify that it really applied the new setting.

rberek · Joined: 10 Jan 2005 Posts: 207 Location: Ottawa, Canada

The only low voltage restriction I'm aware of is that you can not do a Block Erase of the Flash memory at less than 4.5V.