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SX Microcontroller port pins

"When I set a port pin as an input, then ground & unground it with a switch, it sometimes works & other times doesn't work."
You have a floating input; You want to use a pull-up or a pull-down resistor, if you are driving this pin with an open drain or a switch to Vcc or Ground, directly. 10k is a good value here. See Extra, unused pins

SX Microcontroler Port Setup

SX Microcontroller Input / Output Port Expansion

file: /Techref/scenix/lib/io/osi2/portpins_sx.htm, 0KB, , updated: 2005/11/30 16:32, local time: 2024/11/21 23:57,
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Quick, Easy and CHEAP! RCL-1 RS232 Level Converter in a DB9 backshell
Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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