TTP252 datasheet(11/40 Pages) TONTEK

11 / 40 page

Preliminary

TTP252

TonTouch

12’/08/21

Page 11 of 40

Ver: 3.0

S-1: System Oscillator

The high speed oscillator is operated in built-in RC mode. Built-in RC

oscillator is fixed 4MHz

S-2: Peripheral Oscillator

The low speed oscillator was built-in an internal RC oscillator that is for

low power consumption consideration and fixed peripheral device timing

control. Built-in RC oscillator and the frequency range between 12 KHz ~

21 KHz.

S-3: CPU clock

The CPU clock comes from system/peripheral oscillator which was

controlled by H/L bit in PS register. In the normal operation, the system

clock comes from high speed system oscillator (OSCH/N/2). N is define by

CPUFS register. The low speed operation frequency (OSCL/2) comes from

RC oscillator was selected by mask option.

CPUFS (ADDRESS : 219H) : CPU frequency division’s register[R/W]

Bit3

Bit2

Bit1

Bit0

Default Value

Bit Name

CS1

CS0

Read/Write

R/W

0000B

CS1~CS0: the selector value of CPU division’s register

CS1 ~ CS0

CPU frequency

RC=4MHz

OSCH/1

4MHz

OSCH/2

2MHz

OSCH/4

1MHz

OSCH/8

500KHz

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