GPIO setting, please help

LZH

Intellectual 700 points

Hi, everyone,

This refers to CC253x System-on-Chip Solution for 2.4 GHz IEEE 802.15.4 and ZigBee® Applications User's Guide, Pg81-84,

when P1SEL bit set to 0, the pin is a general IO pin

When P1DIR bit set to 0, it' a input, otherwise it's a output

My question is, when P1INP bit set to 1 and P1DIR bit set to input, is it disable the pull-up/ pull-down function?

When the P1DIR bit set to output, and P1INP bit set to 1, is it refer to a tri-state output pin? if yes, how to set to the High-Z mode?

Thank you very much.

over 15 years ago

0 hec over 15 years ago

TI__Genius 10955 points

When the P1DIR bit is set to 1 (output), the pull-up/pull-down is automatically disabled, i.e. the P1INP bit is ignored in this case. In order to set tri-state (high Z) mode, you need to set the pin as an input, i.e., set the P1DIR bit to 0 and the P1INP bit to 1.

0 LZH over 15 years ago in reply to hec

Intellectual 700 points

Hi, Hec,

What I mean is if I don't want the pull up/down resistor, but I still want the pin config as the input, what shall I do? Thank you.

0 hec over 15 years ago in reply to LZH

TI__Genius 10955 points

You should set the corresponding P1DIR bit to 0 and the P1INP bit to 1.

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GPIO setting, please help