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±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
Table 17. Keypad Control Register (Write 0x0041/Read 0x8041)
BIT15
BIT14
BIT13
BIT12
BIT11
BIT10
BIT9
BIT8
BIT7
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
BIT0
KEYSTS1
KEYSTS0 DBN2
DBN1
DBN0
HLD2
HLD
HLD
0
0
0
0
0
0
0
0
Table 18. Keypad Control Register Bit Descriptions (Write 0x0041/Read 0x8041)
BIT
15 (MSB)
14
13
12
11
10
9
8
[7:0]
NAME
KEYSTS1
KEYSTS0
DBN2
DBN1
DBN0
HLD2
HLD1
HLD0
0
DESCRIPTION
Read: keypad interrupt status; Write: set interrupt initiated keypad scans
Read: keypad scan status; Write: stop keypad scan
Keypad debounce time control
Keypad debounce time control
Keypad debounce time control
Keypad hold time control
Keypad hold time control
Keypad hold time control
Reserved
Table 19. KEYSTS1/KEYSTS0 Functions
KEYSTS1
0
1
0
1
KEYSTS0
0
0
1
1
READ FUNCTION
No button press detected;
scan or debounce in progress
Button press detected;
scan or debounce in progress
No button press detected;
data available
Button press detected;
data available
WRITE FUNCTION
Scans keypad once and waits to detect a button press. Upon
detection, issues an interrupt and waits for the host’s instruction
before scanning.
Stops any ongoing scan and waits to detect a button press. Upon
detection, issues an interrupt and scans the keypad.
Stops any ongoing scan and waits to detect a button press. Upon
detection, issues an interrupt and waits for the host’s instruction
before scanning.
Stops any ongoing scan and powers down the button press
detection circuit. No button presses are detected in this mode.
Table 20. Keypad Debounce Time Control
DBN2
0
0
0
0
1
1
1
1
DBN1
0
0
1
1
0
0
1
1
DBN0
0
1
0
1
0
1
0
1
FUNCTION (ms)
Debounce time: 2
Debounce time: 10
Debounce time: 20
Debounce time: 50
Debounce time: 60
Debounce time: 80
Debounce time: 100
Debounce time: 120
24
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