System control register

STMPE1600

14/27

Doc ID 16938 Rev 3

5

System control register

SYS_CTRL

System control register

Address:

0x03

Type:

RW

Reset:

0x00

Description:

System control register.

7654

3

2

1

0

SOFT

RESET

I2C_SHDN

Wakeup_En

RESERVED

RESERVED

INT_Enable

RESERVED

INT_Polarity

RW

RW

RW

––

RW

–

RW

[7] SOFT RESET:

Writing ‘1’ to this bit causes a soft reset

Cleared by hardware.

[6] I2C_SHDN:

Writing ‘1’ to this bit shuts down the I2C block on the next valid I2C clock.

In shut-down mode, only 2 possible ways exist to re-activate the device:

- Remove and reconnect Vcc

- Wake_up through the GPIO_0 pin if programmed as a hot-key and if Wakeup Enable bit of

this register is enabled

All GPIO states remain the same on entering shut-down mode.

[5] Wakeup_En:

Wakeup Enable bit

‘1’ to enable GPIO_0 as clock gating signal during shutdown

‘0’ to disable the above

[4] RESERVED

[3] RESERVED

[2] INT_Enable:

‘1’ to enable interrupt output

‘0’ to disable interrupt output

When the interrupt output is disabled, it is in floating condition but it does not consume current

[1] RESERVED

[0] INT_Polarity:

Interrupt polarity

‘1’ for active High

‘0’ for active LOW