18F4550 Not Recognised

[mister_e]

This is always nice when we have the code (and schematic) to evaluate any kind of potential issue.

BUT leaving Low-Programming mode enabled is a sure way to have some issue one day or another... unless you don't use this pin and set it to GND via a pull-down resistor.

This rule apply to all PIC with Low-Voltage programming mode.

[bholmen]

Thanks for the reply. I will have to read up on the low voltage programming. I must be thinking it was different than it is. I always have the same comment you do (where is the schematic and code you are having trouble with), not so much here on this forum but on most groups I belong to. So much good advice here but also so many details to pay attention to.

Bruce