STMPE812 datasheet(34/51 Pages) STMICROELECTRONICS

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Touchscreen controller

STMPE812

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Doc ID 17732 Rev 3

TSC_DET_CFG2

TSC detection configuration 2 register

Address:

0x42

Type:

R/W

Reset:

0xB0

Description:

Touchscreen controller detection configuration 2 register.

7654

Acq_Mode

StatusRead

OpMode

Z-Divider[3:0]

1011

[7:6] Acq_Mode

‘00’ – Data acquisition timed by internal timer

‘01’ – Data acquisition triggered by a write to “ACQ” bit

‘10’ – Data acquisition using Host-Controlled Sampling Rate Control. (Default)

‘11’ – Reserved

In mode ‘10’, device sample a complete data set every time host accesses the buffer. After

completion of sampling, device enters hibernate mode, until data is accessed again. (Or PEN-

UP causing interrupt to de-assert)

[5] StatusRead

‘1’ will insert data valid (data available) status read in data port.

Reading data port in this mode will clear the ISR register

‘0’ – no data valid (data available) status access by data port

[4] OpMode

TSC operating mode

‘0’ for 12-bit X,12-bit Y,8-bit Z acquisition

‘1’ for 12-bit X, 12-bit Y only (Default)

This field cannot be written on, when EN=1

[3:0] Z-Divider[3:0]

Pen-Pressure is internally calculated as a 16-bit integer. As 16-bit resolution is typically not

required for touchscreen operation, STMPE812 right-shifts the value internally by Z-

Divider[3:0].

Z-value read through the TSC Data register is the lowest 8-bit of the shifted value.

Obsolete

Product(s)

- Obsolete

Product(s)

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