Touch Key Function; Touch Key Structure; Touch Key Register Definition - Holtek BS83A04C Manual

Touch Key Function

The device provides multiple touch key functions. The touch key function is fully integrated and
requires no external components, allowing touch key functions to be implemented by the simple
manipulation of internal registers.

Touch Key Structure

The touch keys are pin shared with the I/O pins, with the desired function chosen via the pin-shared
selection register bit. Keys are organised into one group, known as a module. The module is a fully
independent set of four Touch Keys and has its own oscillator. The module contains its own control
logic circuits and register set.

Touch Key Register Definition

The touch key module 0, which contains four touch key functions, is controlled using several
registers. The following table shows the register set for the touch key module 0.
Register Name
TKTMR
TKC0
TKC1
TKC2
TK16DL
TK16DH
TKM016DL
TKM016DH
TKM0ROL
TKM0ROH
TKM0C0
TKM0C1
TKM0C2
TKM0TH16L
TKM0TH16H
TKM0THS
Register
Name
7
TKTMR D7
TKC0 TKRAMC TKRCOV
TKC1 D7
TKC2 —
TK16DL D7
TK16DH D15
TKM016DL D7
TKM016DH D15
TKM0ROL D7
TKM0ROH —
Rev. 1.00
4-Key Enhanced Touch I/O Flash MCU
Total Key Number Touch Key
4 KEY1~KEY4
Touch Key Structure
Touch key time slot 8-bit counter preload register
Touch key function control register 0
Touch key function control register 1
Touch key function control register 2
Touch key function 16-bit counter low byte
Touch key function 16-bit counter high byte
Touch key module 0 16-bit C/F counter low byte
Touch key module 0 16-bit C/F counter high byte
Touch key module 0 reference oscillator capacitor selection low byte
Touch key module 0 reference oscillator capacitor selection high byte
Touch key module 0 control register 0
Touch key module 0 control register 1
Touch key module 0 control register 2
Touch key module 0 16-bit threshold low byte
Touch key module 0 16-bit threshold high byte
Touch key module 0 threshold comparison flag
Touch Key Function Register Definition
6 5 4
D6 D5 D4
TKST TKCFOV
D6 D5 —
— — —
D6 D5 D4
D14 D13 D12
D6 D5 D4
D14 D13 D12
D6 D5 D4
— — —
64
Shared I/O Pin
PA5, PA1, PA3, PA4
Description
Bit
3 2
D3 D2
TK16OV TKMOD1 TKMOD0
TK16S1 TK16S0 TKFS1
— TSC ASMP1
D3 D2
D11 D10
D3 D2
D11 D10
D3 D2
— —
BS83A04C
1 0
D1 D0
TKBUSY
TKFS0
ASMP0
D1 D0
D9 D8
D1 D0
D9 D8
D1 D0
D9 D8
March 24, 2020