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±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
Table 25. Keypad Column Mask Register Bit Descriptions (Write 0x0051/Read 0x8051)
BIT
15
14
13
12
[11:0]
NAME
CM4
CM3
CM2
CM1
0
DESCRIPTION
Mask interrupt, status register, and pending register data update on all keys in column 4
Mask interrupt, status register, and pending register data update on all keys in column 3
Mask interrupt, status register, and pending register data update on all keys in column 2
Mask interrupt, status register, and pending register data update on all keys in column 1
Reserved
Table 26. GPIO Control Register (Write 0x004F/Read 0x804F)
BIT15
GP7
BIT14
GP6
BIT13
GP5
BIT12
GP4
BIT11
GP3
BIT10
GP2
BIT9
GP1
BIT8
GP0
BIT7
OE7
BIT6
OE6
BIT5
OE5
BIT4
OE4
BIT3
OE3
BIT2
OE2
BIT1
OE1
BIT0
OE0
Table 27. GPIO Control Register Bit Descriptions (Write 0x004F/Read 0x804F)
BIT
NAME
1
DESCRIPTION
0
15
14
13
12
11
10
9
8
[7:0]
GP7
GP6
GP5
GP4
GP3
GP2
GP1
GP0
[OE7:OE0]
C4 pin becomes GPIO pin 7
C3 pin becomes GPIO pin 6
C2 pin becomes GPIO pin 5
C1 pin becomes GPIO pin 4
R4 pin becomes GPIO pin 3
R3 pin becomes GPIO pin 2
R2 pin becomes GPIO pin 1
R1 pin becomes GPIO pin 0
GPIO pin configured as an output
C4 pin remains keypad column 4
C3 pin remains keypad column 3
C2 pin remains keypad column 2
C1 pin remains keypad column 1
R4 pin remains keypad row 4
R3 pin remains keypad row 3
R2 pin remains keypad row 2
R1 pin remains keypad row 1
GPIO pin configured as an input
Table 28.GPIO Pullup Disable Register (Write 0x004E/Read 0x804E)
BIT15
PU7
BIT14
PU6
BIT13
PU5
BIT12
PU4
BIT11
PU3
BIT10
PU2
BIT9
PU1
BIT8
PU0
BIT7
0
BIT6
0
BIT5
0
BIT4
0
BIT3
0
BIT2
0
BIT1
0
BIT0
0
Table 29. GPIO Pullup Disable Register
Descriptions
Analog Input Data Registers
Table 30 shows the format of the X, Y, Z 1 , Z 2 , BAT1,
BAT2, AUX1, AUX2, TEMP1, and TEMP2 data registers.
BIT
[15:8]
[7:0]
NAME
[PU7:PU0]
0
DESCRIPTION
1: Pullup disabled. Open collector output.
0: Pullup enabled.
Reserved: always write as zero.
The data format for these registers is right justified
beginning with bit 11. Data written through the serial
interface to these registers is not stored.
Keypad Data Registers
Table 31 shows the formatting of the keypad data regis-
Data Registers
The data results from conversions or keypad scans are
held in the data registers of the MAX1233/MAX1234.
During power-up, all of these data registers with the
exception of the DAC data register default to 0000 H .
The DAC register defaults to 1000 H .
ters, while Tables 32, 33, and 34 provide individual reg-
ister bit descriptions. These registers have the same
format as the keypad mask register. Each bit repre-
sents one key on the keypad. Table 35 shows a map of
a 16-key keypad. Data written through the serial inter-
face to these registers is not stored.
26
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