What do you mean?Originally Posted by mackrackit
Are you saying that the Vss and Vdd pins are not necessary or can be omitted?
Robert
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Re: Why Or'd Vcc with backup battery output shorted battery life?
What do you mean?
Robert
"No one is completely worthless. They can always serve as a bad example."
Anonymous
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Re: Why Or'd Vcc with backup battery output shorted battery life?
No, I am saying that it can.Vss and Vdd pins are not necessary or can be omitted?
Say you have a MCU with an I/O sourced to different power supplies. If the I/O is high and the power is cut to the MCU the MCU will not be able to reset. The voltage on the I/O will keep the MCU running or in a near run state. The I/O can even be a RS232 input.
For a test, have the MCU keep a LED high (lighted), apply 5 volts to an input. Turn the power off to the MCU while keeping the input at 5 volts. Look at the LED.
Dave
Always wear safety glasses while programming.
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Re: Why Or'd Vcc with backup battery output shorted battery life?
YEP!! you can power PIC's through the I/O pins... anyway take a look here...Vss and Vdd pins are not necessary or can be omitted?
http://www.t4f.org/en/projects/open-rfid-tag/57
I would never have thought it possible... I am sure there are current limitations, though.
I ran across this on one of my favorite web sites... www.hackaday.com
Dwight
These PIC's are like intricate puzzles just waiting for one to discover their secrets and MASTER their capabilities.
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