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PIC18F452 Power-up problem

 
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bloues



Joined: 25 Nov 2003
Posts: 3

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PIC18F452 Power-up problem
PostPosted: Fri Dec 19, 2003 12:21 am     Reply with quote
Hi all

Yesterday I've posted a topic "PIC18F452 Power-up problem". (Read that post to see the problem). I fixed the problem, but not with a smaller capacitor value to pic up the MCLR line as quickly as possible, but with a much larger capacitor C1 (220uF). When the system starts-up, this capacitor take some time to charge, thus keeping MCLR low for some time and then pulling it high causing the system to start-up correctly.

Can somebody explain to me why this is happening?

Thanks
Willie
Johannes



Joined: 05 Dec 2003
Posts: 10
Location: Port Elizabeth, South Africa

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PostPosted: Fri Dec 19, 2003 3:06 am     Reply with quote
Hi Willie,

I coudn't view your picture from your previous post. This is most likely a problem on my side as we are busy integrating a new proxy server.
However I use the following method on all my circuit boards and haven't had one problem.

www.s4.co.za/temp/18f458.jpg
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