Electronics > Microcontrollers

Poweron problems using PIC and automotive application

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mtechmatt:
Ok,

So I have had a redesign, and utilised a proper IC for powerup RESET triggering on the MCLR line.

Also, I have added some more stuff to the power supply.

I have a  question:
When programming, MCLR is driven to 13v, will this effect the monitor IC? Should I have a diode in there, or a current limiting resistor? Its a microchip part (MCP100) and in their application doc it just links up as shown straight to the MCLR line... are they allowing for programming?

SeanB:
Just add a pin header and a shorting link across it, or a wire jumper that can be cut and resoldered if you have to reflash. Once the firmware is working the jumper can be the link in production.

mtechmatt:

--- Quote from: SeanB on July 10, 2012, 06:26:52 pm ---Just add a pin header and a shorting link across it, or a wire jumper that can be cut and resoldered if you have to reflash. Once the firmware is working the jumper can be the link in production.

--- End quote ---

Good idea, that removes all of my concerns, I think :)
Thanks

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