CRTOUCH Datasheet, PDF (57/68 Pages) Freescale Semiconductor, Inc – Capacitive and Resistive Touch Sensing Application Specific IC.

Memory Map and Registers Description
Signal
7
MAXKEYS
6
BUFFOV
5
Reserved
4
KEYEXEN
3
BUFFOVEN
2
AUTOREPEN
1
RELEN
0
TOUCHEN
Description
This bit reflects if the number of keys allowed to be touched at the same time through the Max
Keys register has been exceeded. This bit is automatically cleared when the condition is no
longer true.
1 Number of key is exceeded
0 Number of keys below the configured value
This bit reflects if the Keypad FIFO is full. This bit is automatically cleared with a read of the
register.
1 Keypad FIFO holds 16 events
0 Keypad FIFO has free elements
Reserved
If this bit is set, the Capacitive Event bit in the Status Register 2 Is set when the MAXKEYS flag
is set.
1 Keys exceeded event enabled
0 Keys exceeded event disabled
If this bit is set, the Capacitive Event bit in the Status Register 2 Is set when the BUFFOV flag
is set.
1 Buffer overflow event enabled
0 Buffer overflow event disabled
If this bit is set, the new touch events are stored in the Keypad FIFO at the rate defined by the
AUTORPRATE register while the electrode remains touched.
1 Touch event auto repeat enabled.
0 Touch event auto repeat disabled.
If this bit is set, electrode release events are stored in the Keypad FIFO.
1 Release events stored in FIFO
0 Release events not stored in FIFO
If this bit is set, electrode touch events are stored in the Keypad FIFO.
1 Touch events stored in FIFO
0 Touch events not stored in FIFO
4.2.5.12 Auto repeat rate register
Bit
Field
7
6
5
4
3
2
AUTORPRATE
1
0
Signal
7–0
AUTORPRATE
Description
Auto repeat rate — Sets the rate at which the pressed keys are reported when kept pressed. If
set to 0, no auto-repeat occurs and the event will be automatically disabled in the Events
Register. The user must manually re-enable this event if desired.
0 Auto-repeat feature disabled
1–255 Touch event reported every n measurements
CRTouch Data Sheet, Rev. 3
Freescale Semiconductor
57