CRTOUCH Datasheet, PDF (42/68 Pages) Freescale Semiconductor, Inc – Capacitive and Resistive Touch Sensing Application Specific IC.

Memory Map and Registers Description
Signal
7-4
Reserved
3-0
E3-E0
Reserved
Description
E3 – E0 represents the status of the corresponding electrode. A bit set to
1 indicates that the corresponding electrode is detecting a touch event.
4.2.2.2 Capacitive Touch Faults register
Bit
7
6
Field
5
4
Reserved
3
2
1
0
SE
Signal
7-1
Reserved
0
Shortened
Electrode
Reserved
Description
Indicates if one of the capacitive electrodes cannot be measured, typically
due to a short to V_cc or ground.
1 Timeout fault detected
0 No timeout fault detected
4.2.2.3 Electrodes Baselines registers
Bit
Field
15 14 13 12 11
10
ExBASELINEMSB
9 8 76543 2 10
ExBASELINELSB
Signal
Description
15-8
Most significant Byte for Electrodes 0 to 3 baseline. The baseline value is compared
Electrode Baseline to the instant value to determine if the electrode is touched or not.
MSB
7-0
Least significant byte for electrodes 0 to 3 baseline. The baseline value is compared
Electrode Baseline to the instant value to determine if the electrode is touched or not.
LSB
4.2.2.4 Electrodes instant Delta registers
Bit
7
6
Field
5
4
3
2
ExINSTANTDELTA
1
0
CRTouch Data Sheet, Rev. 3
42
Freescale Semiconductor