TTP259-ASFN datasheet(28/81 Pages) TONTEK

28 / 81 page

Preliminary

TTP259

TonTouch

2015/05/25

Page 28 of 81

Ver: 1.1

FST is set, frequency shift function will be activated. Swing shift back and forth

from the center frequency. Set FST=0 to off frequency shift function. When

frequency shift function is executing, OSCHADJF will be set 0. Then user can

not change OSCHADJ and FST, but only can be set 0 to off function. Frequency

shift function will not immediately stop, when FST is set to 0, the need to wait

until the frequency back to the original frequency, while OSCHADJF will be set

to 1.

OSCHADJ use ranges from 1 to 8, do not use the value out of range.

P-2: Time Base

The time base has 2 interrupt sources and both of them come from

the peripheral internal RC oscillator. The time base 1st overflow output

(TB1OV) can cause interrupt and the period is selected by TB1S2~TB1S0

in TBC register. The time base 2nd overflow output (TB2OV) also offers

two sample frequency options by TB2S bit in the TBC register.

8-bit

Counter

TBLDR

reload

clear

TBCK/128

TBCK/256

TBCK/512

TBCK/1024

TBCK/2048

TBCK/4096

TBCK/8192

TBCK/16384

TB2OV

TB2S

TB1OV

TB1S2~TB1S0

7-bit

Counter

TBCK

128Hz

64Hz

32Hz

16Hz

8Hz

4Hz

2Hz

1Hz

Write TBRB to

reload 8-bit counter

and clear 7-bit counter

TTP259-ASFN Datasheet(PDF) 28 Page - Tontek Design Technology

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