CRTOUCH Datasheet, PDF (54/68 Pages) Freescale Semiconductor, Inc – Capacitive and Resistive Touch Sensing Application Specific IC.

Memory Map and Registers Description
Signal
7–4
Reserved
LPSP
Reserved
Description
Determines scan period in low power mode. Only selection from the list of predefined values is
allowed.
0000 — 1 ms scan interval
0001 — 5 ms scan interval
0010 — 10 ms scan interval
0011 — 15 ms scan interval
0100 — 20 ms scan interval
0101 — 30 ms scan interval
0110 — 40 ms scan interval
0111 — 50 ms scan interval
1000 — 75 ms scan interval
1001 — 100 ms scan interval
1010 — 125 ms scan interval
1011 — 150 ms scan interval
1100 — 200 ms scan interval
1101 — 300 ms scan interval
1110 — 400 ms scan interval
1111 — 500 ms scan interval
4.2.5.8 Low Power Electrodes register
This register represents the number of the electrodes scanned in the low power mode.
Bit
Field
7
6
5
4
3
Reserved
2
1
0
LPEL
Signal
7–2
Reserved
1–0
LPEL
Reserved
Description
Low Power Electrode — This value selects which of the four electrodes, from E0 – E3, will be
scanned when the system is in Shutdown mode and the CLPEN bit is enabled in the Capacitive
System Configuration register.
4.2.5.9 Low Power Electrode Sensitivity register
Bit
Field
7
6
5
Reserved
4
3
2
LPSENS
1
0
CRTouch Data Sheet, Rev. 3
54
Freescale Semiconductor