68300

Tim,

I would not do this.  It creates a lot of noise on the board.  You are 
trying to force 100ma thru two pins on the processor.  The pins rated at 
10ma will source a lot more than 10ma. the same for the 1/3 drive 
pins.  You will not know what voltage is generated on either end of the 
resistor when the contention happens.

Maybe there is some other solution to the design you are trying to accomplish.



At 08:06 AM 4/5/2005, you wrote:

>Hello all,
>This isn't actually a question about the 683xx, but for the HCS12DP256.
>Some I/O pins have the capability of full (10ma) drive and 1/3 drive
>settings.
>What is the reliability of the processor if I drive a full drive pin to
>VCC and connect it via a (approx) 50 ohm resistor to an other pin
>driven low with 1/3 drive? This contention would last for ~ 200
>microseconds out of a period of 40 milliseconds. 0.5% duty cycle
>effectively.
>Basically like an active pull down.
>
>or please point me in the correct direction.
>
>Tim Flynn
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
Sincerely,

Robert E. Yablonski


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