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Discussion Groups | BasicX | Pull-up and pull-down resistors
Discussion forum for the BasicX family of microcontroller chips.
Pull-up and pull-down resistors - David Sousa Mendes - Nov 1 4:52:16 2006
Hello
I read the following sentence related to the I/O pins:
" If unused keep pins with a pull up or pull down resistor while the pin is set to input."
I've often read about pull-up and pull-down resistor without knowing the meaning...
Some schematics available?
Cheers
David Mendes
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
I read the following sentence related to the I/O pins:
" If unused keep pins with a pull up or pull down resistor while the pin is set to input."
I've often read about pull-up and pull-down resistor without knowing the meaning...
Some schematics available?
Cheers
David Mendes
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Pull-up and pull-down resistors - Mechatronics At Camden CC - Nov 1 9:05:40 2006
http://scmstore.com/scm-hacker/num22/project/sw2.jpg
http://scmstore.com/scm-hacker/num22/project/sw1.jpg
Above is a sinking or sourcing schematics. What I seen happens is that if you don't do it it will tend to float. Try it out. Set one of the unused pins as an input and sent the state to the debug. You will see that it will be EX (00000100001111001001) .. Once you put the pull down or pull up resister to the pin it will stop. This is always a good idea to put a pull down resister on all unused pins. When your sinking the switch brings the input to 0volts so you program it to look of the low. When your sourcing your giving it the 5 volts and looking for the high.
hope this helps
David Sousa Mendes wrote:
Hello
I read the following sentence related to the I/O pins:
" If unused keep pins with a pull up or pull down resistor while the pin is set to input."
I've often read about pull-up and pull-down resistor without knowing the meaning...
Some schematics available?
Cheers
David Mendes
[Non-text portions of this message have been removed]
__________________________________________________
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
http://scmstore.com/scm-hacker/num22/project/sw1.jpg
Above is a sinking or sourcing schematics. What I seen happens is that if you don't do it it will tend to float. Try it out. Set one of the unused pins as an input and sent the state to the debug. You will see that it will be EX (00000100001111001001) .. Once you put the pull down or pull up resister to the pin it will stop. This is always a good idea to put a pull down resister on all unused pins. When your sinking the switch brings the input to 0volts so you program it to look of the low. When your sourcing your giving it the 5 volts and looking for the high.
hope this helps
David Sousa Mendes
Hello
I read the following sentence related to the I/O pins:
" If unused keep pins with a pull up or pull down resistor while the pin is set to input."
I've often read about pull-up and pull-down resistor without knowing the meaning...
Some schematics available?
Cheers
David Mendes
[Non-text portions of this message have been removed]
__________________________________________________
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Pull-up and pull-down resistors - Tom Becker - Nov 1 13:12:09 2006
Here's another tutorial:
http://www.seattlerobotics.org/encoder/mar97/basics.html
Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
http://www.seattlerobotics.org/encoder/mar97/basics.html
Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )