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[avr-gcc-list] Glitch on GPIO

From: Jahagirdar Gopal-AGJ005
Subject: [avr-gcc-list] Glitch on GPIO
Date: Thu, 23 Feb 2006 12:10:53 +0800


I have one peculiar problem here.

One of the GPIO of atmega128, has been pulled up. When atmega128 boots up, initialization script makes that GPIO pin high, irrespective of what is pulled up (Atmega does not start booting immediately the power is given. There is some delay given purposely between power-up and execution de-assertion of reset signal). So the expected behavior is that pin should continue to be high as measured on CRO. But there is a glitch (10us) on that pin when GPIO is written high by software.


Any idea on this behavior? Can this be solved?



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