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How to Demux I/O of PIC16f84A?

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nenayd

New Member
Yo! :D
can somebody teach me how to demultiplex the input and outputs of pic16f84a? what demux ic is better for pic16f84a? i'm planning to interface 4 sensors, gsm phone, keypad, solenoid and lcd for my project.

please include some learning materials for memory mapping and new addressing modes if persist.

Thanks a lot :lol:
 

Eclipsed

New Member
What do you mean demultiplex the I/O on a pic? Are you trying to multiplex the keypad or the sensors to save I/O pins?
 

nenayd

New Member
1st thanks for replying. :D

i know that pic16f84a has 13 i/o bi-directional ra0-ra4 port and rb0-rb7 port... to interface my component i must demultiplex some of the ports... to be able to interface keypad, lcd, solenoid and 4 different sensors.

what i want to know is what ports to be demux and ic's to use.
 

tommyc2000

New Member
3333

you can use tri-state buffers on port B, and control lines of those buffers on Port A, I use many of those like: 74ls125, 74ls126, 74ls244 or 74hc244 (i think there's also 74ls245)
 
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