PCA9555: Can this device work with both input and output signal flow?

Francis Jiang

Part Number: PCA9555

Hi Team,

Can this device work with both input and output signal flow? Such as P0~P7 as input IO, P8~P15 as output IO. Is there any notices with the timing sequence of read and write? Thanks.

BRs,

Francis

over 2 years ago

+1 Clemens Ladisch over 2 years ago

Guru 318050 points

The configuration registers allow all bits to be set as input or output separately.

Just read from the input port registers, and write to the output port registers. (Reading an output pin returns it current value; writing to an input pin is ignored.)

0 Francis Jiang over 2 years ago in reply to Clemens Ladisch

TI__Expert 3520 points

Hi Clemens,

Thanks for your help. No problem here.

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PCA9555: Can this device work with both input and output signal flow?