Initializing a port on download?

[jharkins]

I've got a new 18F452 based board that has a CPLD who's chip select is port C pin 5, active low. Unfortunatly, right after download that pin is low, so my CPLD is selected. Even more unfortunate, the CPLD uses the ICD-S lines. The upshot is I can't run this thing with ICD attached.

Is there a way, like a #rom or something, to have port C pin 5 start out hi? I understand that I won't be able to use the ICD whilst talking to my CPLD, I can live with that. But I'd sure like to use it when I'm not using the CPLD.
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This message was ported from CCS's old forum
Original Post ID: 12592

[PCM programmer]

:=I've got a new 18F452 based board that has a CPLD who's chip select is port C pin 5, active low. Unfortunatly, right after download that pin is low, so my CPLD is selected. Even more unfortunate, the CPLD uses the ICD-S lines. The upshot is I can't run this thing with ICD attached.
:=
:=Is there a way, like a #rom or something, to have port C pin 5 start out hi? I understand that I won't be able to use the ICD whilst talking to my CPLD, I can live with that. But I'd sure like to use it when I'm not using the CPLD.
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Do you know why Pin C5 is starting out low ?
The default state for that pin, upon power-up, is to be
an input. So unless you're running code that deliberately
sets it as a low-true output, it should stay as an input.
Then, you should be able to put a pull-up resistor on it,
to keep it high. Maybe 10K ?
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This message was ported from CCS's old forum
Original Post ID: 12594

[jharkins]

Hmmm, I don't know why it starts out low. One of the first things I do is setup the CPLD. It could be my assumption was wrong, maybe me driving those 2 lines (D6 and 7) confuses the ICD and it just hangs in the midst of CPLD programming. I don't think so though, it hangs right after download with a message along the lines of "Can't halt target, check the oscillator and MCLR". It's times like this I wish I had a logic analyzer, not just a scope.

Never thought I'd have to worry about how many insertions I could get out of an RJ45 before it gave out
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This message was ported from CCS's old forum
Original Post ID: 12628

[Shane Rowell]

I have to agree with PCMProgrammer. Add the pull-up.

:=I've got a new 18F452 based board that has a CPLD who's chip select is port C pin 5, active low. Unfortunatly, right after download that pin is low, so my CPLD is selected. Even more unfortunate, the CPLD uses the ICD-S lines. The upshot is I can't run this thing with ICD attached.
:=
:=Is there a way, like a #rom or something, to have port C pin 5 start out hi? I understand that I won't be able to use the ICD whilst talking to my CPLD, I can live with that. But I'd sure like to use it when I'm not using the CPLD.
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This message was ported from CCS's old forum
Original Post ID: 12631