31 Jul 2010 7:10:05
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 Acqura now have Philips microcontrollers available for sale. If you need P89C668, P89C669, LPC76x or LPC900 family devices, check out our low MOQ's
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Take a look at our new forums. If you have a question about the 8xC51, LPC900, or MX families (or any 8051-related query) then ask your question here.
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| User Support has posted this comment in the I/O Forum |
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| LPC9xx family configuration suggestion |
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Hello All,
Recently there has been some postings about LPC9xx port mode issues. I am not sure if this is documented in the LPC9xx family user manual but ...
When configuring the ports on the LPC9xx device ALWAYS write to the port latch BEFORE changing the associated mode registers.
This is because the mode is change immediately these registers are updated and whatever value is in the port latch will be applied to the outside world.
If you haven't written the port latch then there is a chance that an umintended value will be output. This may only exist for a cycle or two, but ...
Regards,
Graham
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| Click here to see the whole discussion thread. |
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