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Strange PCD implementation of 24FxxKA chips

 
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FvM



Joined: 27 Aug 2008
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Strange PCD implementation of 24FxxKA chips
PostPosted: Thu Oct 29, 2009 4:57 pm     Reply with quote
A colleague reported about obscure behaviour of 24FxxKA chips with PCD, that apparently crashed at the first function call. It turned out, that PCD sets the stack to 0x1580..0x15ff, a memory area, that doesn't exist with these chips.

You need to specify a correct stack usage explicitely
Code:
#build(stack=0xd7f:0xdFF)

Also the configuration registers seem to be accessed upside down (according to a recent MPLAB version), so oscillator, watchdog and other settings are completely confused.

There are more flaws as forgotten SPI resources. It's possibly though to use the chip with PCD.
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