STMPE812ABJR datasheet(34/53 Pages) STMICROELECTRONICS

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Touchscreen controller

STMPE812A

34/53

Doc ID 18225 Rev 4

TSC CTRL

TSC control register

Address:

0x40

Type:

R/W

Reset:

0x00

Description:

Touchscreen control register.

7654

MAV_MODE[2:0]

ACQ

Precharge[1:0]

Current Limit [1:0]

[7:5] MAV_MODE[2:0]

‘000’ – MAV filter disabled

‘001’ – 6 remove 2

‘010’ – 8 remove 4

‘011’ – 10 remove 2

‘100’ – 12 remove 4

‘101’ – 20 remove 4

‘110’ – 4 remove none (equal to 4 x oversampling)

‘111’ – 8 remove none (equal to 8 x oversampling)

[4] ACQ

Only valid in acquisition mode ‘01’ (acquisition initiated by system host writing to ACQ bit)

Writing ‘1’ to this bit initiates a TSC data acquisition

Writing ‘0’ has no effect

Reads ‘1’ if data acquisition is in progress

Reads ‘0’ if data is ready

If Data is already available in buffer and not read by system host, setting this bit to ‘1’ renders

the data in buffer “invalid”. DATA available bit in Interrupt Status register is reset by hardware

automatically. Pending interrupt due to DATA available (if any) is cleared.

Data pointer in multi-byte read operation is reset when this bit is written to.

[3:2] Precharge[1:0]

Pre-charge driver for touch detection

‘00’ – no pre-charge

‘01’ – 2 µs pre-charge

‘10’ – 4 µs pre-charge

‘11’ – 8 µs pre-charge

[1:0] Current Limit [1:0]

Current limit of touchscreen driver

‘00’ – 5 mA

‘01’ – 10 mA

‘10’ – 20 mA

‘11’ – 30 mA

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