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±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
allowing certain keys to be masked from detection.
Tables 18–21 show the programmable bits of the keypad
control register. Tables 23, 24, and 25 show the program-
mable bits of the keypad mask registers. The Keypad
Controller and GPIO section provides more details.
GPIO Control Register
The GPIO control register and the GPIO pullup register
allow the keypad controller’s row and column inputs to be
configured as up to eight parallel I/O pins. Tables 26 and
27 show the GPIO control register layout and control reg-
ister descriptions. Tables 28 and 29 show the GPIO pullup
disable register and associated descriptions. For more
information, see the Applications Information section.
Table 21. Keypad Hold Time Control
HLD2
0
0
0
0
1
1
1
1
HLD1
0
0
1
1
0
0
1
1
HLD0
0
1
0
1
0
1
0
1
FUNCTION
If a button is held, wait 100μs before beginning next debounce scan
If a button is held, wait 1 debounce time before beginning the next debounce scan
If a button is held, wait 2 debounce times before beginning the next debounce scan
If a button is held, wait 3 debounce times before beginning the next debounce scan
If a button is held, wait 4 debounce times before beginning the next debounce scan
If a button is held, wait 5 debounce times before beginning the next debounce scan
If a button is held, wait 6 debounce times before beginning the next debounce scan
If a button is held, wait 7 debounce times before beginning the next debounce scan
Table 22. Keypad Key Mask Register Bit Descriptions (Write 0x0050/Read 0x8050)
BIT15
KM15
BIT14
KM14
BIT13
KM13
BIT12
KM12
BIT11
KM11
BIT10
KM10
BIT9
KM9
BIT8
KM8
BIT7
KM7
BIT6
KM6
BIT5
KM5
BIT4
KM4
BIT3
KM3
BIT2
KM2
BIT1
KM1
BIT0
KM0
Table 23. Keypad Key Mask Register Bit Descriptions (Write 0x0050/Read 0x8050)
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NAME
KM15
KM14
KM13
KM12
KM11
KM10
KM9
KM8
KM7
KM6
KM5
KM4
KM3
KM2
KM1
KM0
DESCRIPTION
Mask status register data update on individual key for row 4, column 4
Mask status register data update on individual key for row 3, column 4
Mask status register data update on individual key for row 2, column 4
Mask status register data update on individual key for row 1, column 4
Mask status register data update on individual key for row 4, column 3
Mask status register data update on individual key for row 3, column 3
Mask status register data update on individual key for row 2, column 3
Mask status register data update on individual key for row 1, column 3
Mask status register data update on individual key for row 4, column 2
Mask status register data update on individual key for row 3, column 2
Mask status register data update on individual key for row 2, column 2
Mask status register data update on individual key for row 1, column 2
Mask status register data update on individual key for row 4, column 1
Mask status register data update on individual key for row 3, column 1
Mask status register data update on individual key for row 2, column 1
Mask status register data update on individual key for row 1, column 1
Table 24. Keypad Column Mask Register (Write 0x0051/Read 0x8051)
BIT15
CM4
BIT14
CM3
BIT13
CM2
BIT12
CM1
BIT11
0
BIT10
0
BIT9
0
BIT8
0
BIT7
0
BIT6
0
BIT5
0
BIT4
0
BIT3
0
BIT2
0
BIT1
0
BIT0
0
______________________________________________________________________________________
25
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