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I/O pin(s) and Pull up resistors
I've always stuck by the book and used the 10 k / 220 ohms combo. Works Great. But my current project (Sensor with 2 relays built in) is having me layout/think about my PCB differently. So far in my mind it is not working.
Short of testing and maybe blowing out some I/O pins to figure it out. How would/does and I/O pin respond without the 10 K resistor bypassed and only the 220 ohms resistor receiving the 5 VDC to I/O pin? I know it there for protection, but a constant 5 VDD may be to much....don't know. I've gone through the section in "Whats a MC" and other locations but can't find anything directly related. MY original concept still may not work but this will be a learning curve getting me their.
1) Can a Parallax BS2 family handle VDD on a I/O pin with ONLY a 220 ohm resistor in place?