STMPE321 ST Microelectronics, STMPE321 Datasheet - Page 24

• Manufacturer Part Number: STMPE321
• Description: 3-channel capacitive touch key controller
• Manufacturer: ST Microelectronics

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Capacitive touch module registers
8
TOUCH_FIFO
Address:
Type:
Reset:
Description:
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T7
7
Capacitive touch module registers
Table 10.
T6
6
0x19, 0x18
R
0x00
TOUCH_FIFO is the access port for the internal 4-level FIFO used for buffering the
touch events. While it is possible to access each byte in the data structure directly, it is
recommended that the FIFO is accessed only via the 0x18 address.
The FIFO must be accessed in multiples of 2 bytes (LSB, MSB). For the STMPE321,
MSB is reserved and LSB contains a snapshot of the recent touch event. The FIFO
must be accessed in multiples of 2 bytes (LSB, MSB). For STMPE321, MSB is
reserved and LSB contains a snapshot of the recent touch event.
Where Tn is touch status of touch sensing channel n.
TOUCH_FIFO summary table
T5
5
Address
0x1A
0x1B
0x1C
0x1D
0x1E
0x18
0x19
0x1F
T4
4
Doc ID 15791 Rev 1
T3
3
T2
2
FIFO-0, MSB
FIFO-1, MSB
FIFO-2, MSB
FIFO-3, MSB
FIFO-0, LSB
FIFO-1, LSB
FIFO-2, LSB
FIFO-3, LSB
Function
T1
1
Touch FIFO
STMPE321
T0
0