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07/24/01 10:52
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 		 #13454 - RE: logic comparison on pins
Erik,

some of you are missing that the MCS-51 unlike other architectures has bidirectional ports.

This means there is no input/output, the portpins are wired-and if you like.

And as peter states correctly, all ports are set to FFh during (but not before!) reset. For special open drain ports (such as P0 or I2C pins) this means that they are in high impedance

Cheers, Roger

List of 9 messages in thread
TopicAuthorDate
logic comparison on pins            01/01/70 00:00      
RE: logic comparison on pins            01/01/70 00:00      
RE: logic comparison on pins            01/01/70 00:00      
RE: logic comparison on pins            01/01/70 00:00      
RE: logic comparison on pins            01/01/70 00:00      
RE: logic comparison on pins            01/01/70 00:00      
RE: logic comparison on pins            01/01/70 00:00      
RE: logic comparison on pins, Roger            01/01/70 00:00      
RE: logic comparison on pins, Erik            01/01/70 00:00      

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