EKTF6708 datasheet(100/158 Pages) EMC

100 / 158 page

eKTF6708

8-Bit Microcontroller



IC Product Specification (V1.2) 03.12.2020

(This specification is subject to change without prior notice)

NOTE

In order to obtain accurate values, it is necessary to avoid any data transition on the I/O

pins during AD conversion

6.6.6 Programming Process for Detecting Internal VDD

VDD is detected within the operation, as described in the previous section, the difference is

that before starting the ADC conversion, the first detection of VDD is ready. Therefore in

Detecting VDD:

It should be noted that before starting the AD conversion operation, the channel has to be

switched to Internal Voltage Reference channel, the voltage divider is started, then AD can

be converted. Several points to note is that, precise conversion values can be added in the

VDD Pin capacitance, or more than twice the conversion, taking the average or the last few

strokes data in order to increase the reliability of the data.

6.7 Touch Key Sensor Function

The Touch Key Sensor provides multiple touch key sensing and calculating. The touch key

function is fully integrated and does not require external components, allowing touch key

functions to be implemented by the simple

6.7.1 Touch Key Function Block & Control Register

The Touch Key are pin shared with the P60~P67 I/O pins. Touch Key are organized into

one group. Each group supports 8 detected pins.

Touch Key group

Sensing I/O pins

TK1

TK2

TK3

TK4

TK5

TK6

TK7

TK8

P60

P61

P62

P63

P64

P65

P66

P67

User can set the TKx Pin Control Register (TKAPC) to select this pin as Touch key function

or GP I/O pin.

TKAEP7~0

Pin function

GPIO or Other function

Touch Key Sensor

Touch Key frequency table:

Internal RC Frequency

Touch Key Frequency

4MHz

24MHz

8MHz

24MHz

12MHz

24MHz

16MHz

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