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Re: Atmega32 port c pins
Quote:
Originally Posted by neha
my team has designed a programmer for atmega32. all ports can be programmed successfully however pins 2,3,4,5(starting with 0) of portc cannot be programmed. we wrote a flash led programmer however these mentioned pins do not show any variation. they are showing a constant high. pls help us at the earliest.. thanks
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How are you programing the device? There are multiple methods. These methods are ISP, JTAG, DebugWire, Parallel, and High Voltage. Im suspicious of the fact that pins 2,3,4, and 5 form the basis of JTAG programing.
EDIT:
I think I figured it out. You have JTAG programing enabled. The datasheet says:
Quote:
If the JTAG interface is enabled,
the pull-up resistors on pins PC5(TDI), PC3(TMS) and PC2(TCK) will be activated even if a reset
occurs.
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Hence the reason why the pins don't change value. Try disabling it through the fuse settings.
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Last edited by Adam Y. : 18-01-2008 at 12:02.
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