Uart Inte�Face; Touch Key Function; To�Ch Ke� St - Holtek BS83B24C Manual

Touch Key Function

Each 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
corresponding selection register bits. Keys are organised into several groups, with each group known
as a module and having a module number, M0 to Mn. Each module is a fully independent set of
four Touch Keys and each Touch Key has its own oscillator. Each module contains its own control
logic circuits and register set. Examination of the register names will reveal the module number it is
referring to.
BS�3B�4C
BS�3C40C
Rev. 1.00
Total Key
Device Touch Key Module
Number
Mn
�4
(n=0~5)
Mn
40
(n=0~9)
Touch Key Structure
136
BS83B24C/BS83C40C
Touch Flash MCU
Touch Key
M0 KEY1~KEY4
M1 KEY5~KEY�
M� KEY9~KEY1�
M3 KEY13~KEY16
M4 KEY1�~KEY�0
M5 KEY�1~KEY�4
M0 KEY1~KEY4
M1 KEY5~KEY�
M� KEY9~KEY1�
M3 KEY13~KEY16
M4 KEY1�~KEY�0
M5 KEY�1~KEY�4
M6 KEY�5~KEY��
M� KEY�9~KEY3�
M� KEY33~KEY36
M9 KEY3�~KEY40
�e���a�� 0�� �01�