STMPE821 datasheet(25/55 Pages) STMICROELECTRONICS

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STMPE821

Capacitive touch module registers

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Capacitive touch module registers

TOUCH_FIFO

Touch FIFO

Address:

0x19, 0x18

Type:

Reset:

0x00

Description:

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 bytes 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 STMPE821,

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 STMPE821, MSB is

reserved and LSB contains a snapshot of the recent touch event.

Where Tn is touch status of touch sensing channel n.

Table 10.

TOUCH_FIFO summary table

Address

Function

0x18

FIFO-0, LSB

0x19

FIFO-0, MSB

0x1A

FIFO-1, LSB

0x1B

FIFO-1, MSB

0x1C

FIFO-2, LSB

0x1D

FIFO-2, MSB

0x1E

FIFO-3, LSB

0x1F

FIFO-3, MSB

7654

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