TTP255 datasheet(36/49 Pages) TONTEK

36 / 49 page

Preliminary

TTP255

TonTouch

12’/08/21

Page 36 of 49

Ver3.0

.. I/O port with internal output & external input

The standard input/output port has the I/O control register for

switching input or output mode and output data register stores the output

data in output mode. If control register=1 and output data=1, the I/O port

is programmed as input with pull-up resister and also actives the wake-up

function. User intends to read the port data with differed read instruction.

The read PI is reading data comes from PAD input data. The data register

reading result will have the same value with output register data. If enable

internal output by mask option, the internal output will control by output

data (on/off) and outputs to PAD.

I/O control Data

Output data

Pull-up

Wake-up

Enable

X: don’t care the value

I/O control Data

Internal output

PAD

enable

Output Register data Q*internal data

disable

Output Register data

PAD input data

X: don’t care the value

Read PI

Mode

Read Input Data

Output mode

Output Register data Q

Input mode

PAD input data

TTP255 Datasheet(PDF) 36 Page - Tontek Design Technology