ST7LUS5 datasheet(54/124 Pages) STMICROELECTRONICS

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Power saving modes

ST7LUS5, ST7LU05, ST7LU09

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8.5.1

AWUFH control/status register (AWUCSR)

AWUCSR

Reset value: 0000 0000 (00h)

654

Reserved

AWUF

AWUM

AWUEN

R/W

Table 22.

AWUCSR register description

Bit

Name

Function

7:3

Reserved

2AWUF

Auto Wake-up Flag

This bit is set by hardware when the AWU module generates an interrupt and

cleared by software on reading AWUCSR. Writing to this bit does not change its

value.

0: No AWU interrupt occurred

1: AWU interrupt occurred

1AWUM

Auto Wake-up Measurement

This bit enables the AWU RC oscillator and connects its output to the input capture

of the 8-bit Lite timer. This allows the timer to be used to measure the AWU RC

oscillator dispersion and then compensate this dispersion by providing the right

value in the AWUPRE register.

0: Measurement disabled

1: Measurement enabled

0AWUEN

Auto Wake-up from Halt Enabled

This bit enables the Auto Wake-up from Halt feature: Once Halt mode is entered,

the AWUFH wakes up the microcontroller after a time delay dependent on the

AWU prescaler value. It is set and cleared by software.

0: AWUFH (Auto Wake-up from Halt) mode disabled

1: AWUFH (Auto Wake-up from Halt) mode enabled

Note: Whatever the clock source, this bit should be set to enable the AWUFH mode

once the HALT instruction has been executed.

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