TTP259-ASFN datasheet(49/81 Pages) TONTEK

49 / 81 page

Preliminary

TTP259

TonTouch

2015/05/25

Page 49 of 81

Ver: 1.1

. IO Pad Cell Structure and Function Description

.. IO port with touch pad input

The input/output port has the IO control register for switching input or

output mode and data register stores the output data in output mode. If IO

control register=1 and output data=1, the IO port is programmed as input

with pull-up resistor and also actives the wake-up function. User intends to

read the port data with differed read instruction. The read PxI is reading data

comes from IO pad data. The data register reading result will have the same

value with output register data. Software can performs a configuration

(output data register=0, changing the IO control register 0 or 1) for open

drain type that specifies suitable for key scan application. An additional

feature supports the touch pad input.

X: don’t care the value

Extern input

IO control data

Output data

Pull-up

Wake-up

feature

Disable

Enable

Enable and touch

pad scan

IO control data

IO pad

Output register data

IO pad input data

Read PxI

Read input data

IO pad data

TTP259-ASFN 数据表(PDF) 49 Page - Tontek Design Technology

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