ST7DALIF2 datasheet(59/171 Pages) STMICROELECTRONICS

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ST7DALIF2

Power saving modes

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Bit 2 = AWUF 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

Bit 1= AWUM Auto Wake Up Measurement

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

12-bit Auto-Reload 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

0: Measurement disabled

1: Measurement enabled

Bit 0 = AWUEN 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

AWUFH prescaler register (AWUPR)

Read/Write

Reset Value: 1111 1111 (FFh)

Bits 7:0= AWUPR[7:0] Auto Wake Up Prescaler

These 8 bits define the AWUPR Dividing factor (as explained below):

In AWU mode, the period that the MCU stays in Halt Mode (tAWU in Figure 28 on page 57) is

defined by

This prescaler register can be programmed to modify the time that the MCU stays in Halt

mode before waking up automatically.

AWUPR7

AWUPR6

AWUPR5

AWUPR4

AWUPR3

AWUPR2

AWUPR1

AWUPR0

Table 22.

AWU prescaler

AWUPR[7:0]

Dividing factor

00h

Forbidden

01h

...

FEh

254

FFh

255

AWU

AWUPR

AWURC

--------------------------t

RCSTRT

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