TTP259-ASFN datasheet(55/81 Pages) TONTEK

55 / 81 page

Preliminary

TTP259

TonTouch

2015/05/25

Page 55 of 81

Ver: 1.1

.. IO port with internal PWM output and external

interrupt trigger input

The standard 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 data=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. If enable internal output, the IO port must set as

output (IO control data=0). An additional feature supports the internal PWM

output and external interrupt trigger input.

IO control data

Output data

Pull-up

Wake-up

feature

External

input

Enable

X: don’t care the value

IO control data

Internal output

IO pad

Enable

Output internal data

Disable

Output register data

IO pad input data

X: don’t care the value

Read PxI

Read input data

IO pad data

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