| ??? 06/01/05 15:24 Modified: 06/01/05 15:26 Read: times |
#94194 - the other reason Responding to: ???'s previous message |
There are some '51 derivatives which can have the ports be programmed as push-pull stages. These will show very low output impedances and are suited to drive longer lines.
If you take such an output and short it, the uC is gone. If you use a 74HC(T) buffer, you will have a remarkably strong line. I have never survived shorting a uC push-pull pin, but when a HC(T) pin on a Philips or TI chip, I do not know about other brands has been shorted for hours, the chip still works. Erik |
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