QTouch Library ATtiny20 code and data memory requirements

The code and data memory requirements for QTouch Library for ATtiny20 devices is captured in the Table below. The Table indicates these values for the standalone library and not for the entire Example Project application.

Table 1. Table 19 QTouch Library for ATtiny20 Memory requirements
Library	Number of Sensors	Code Memory	Data memory	CStack/RStack
libtiny20-5qt-k-0rs	5	1231 + 15 bytes Const data	70	CStack= 0x1C bytes RStack= 10 (16 bytes) is the Recommended setting.
libtiny20-5qt-k-0rs	4	1231 + 12 bytes Const data	60	CStack= 0x1C bytes RStack= 10 (16 bytes) is the Recommended setting.
libtiny20-5qt-k-0rs	3	1231 + 9 bytes Const data	50	CStack= 0x1C bytes RStack= 10 (16 bytes) is the Recommended setting.
libtiny20-5qt-k-0rs	2	1231+ 6 bytes Const data	40	CStack= 0x1C bytes RStack= 10 (16 bytes) is the Recommended setting.
libtiny20-5qt-k-0rs	1	1231 + 3 bytes Const data	30	CStack= 0x1C bytes RStack= 10 (16 bytes) is the Recommended setting.

Data memory for ATtiny20 QTouch Library include the following.

1.
QTouch Library data memory – 19 bytes, allocated inside the Library
2.
channel_signals – 2 bytes per Sensor, allocated in main.c
3.
channel_references – 2 bytes per Sensor, allocated in main.c
4.
sensor_delta – 2 bytes per Sensor, allocated in main.c
5.
sensor_general_counter – 2 bytes per Sensor, allocated in main.c
6.
sensor_state – 1 byte per Sensor, allocated in main.c
7.
sensor_ndil_counter – 1 byte per Sensor, allocated in main.c
8.
sensor_states – 1 byte, allocated in main.c

Const Data memory for ATtiny20 QTouch Library include the following:

1.
sensor_threshold, 1 byte per Sensor, allocated in main.c
2.
sensor_hyst_threshold, 1 byte per Sensor, allocated in main.c
3.
sensor_recal_threshold, 1 byte per Sensor, allocated in main.c