ST7LUS5 datasheet(55/124 Pages) STMICROELECTRONICS

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ST7LUS5, ST7LU05, ST7LU09

Power saving modes

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AWUFH prescaler register (AWUPR)

In AWU mode, the period that the MCU stays in Halt mode (tAWU in Figure 24 on page 52) is

defined by:

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

mode before waking up automatically.

Note:

If 00h is written to AWUPR, depending on the product, an interrupt is generated immediately

after a HALT instruction, or the AWUPR remains unchanged.

AWUPR

Reset value: 1111 1111 (FFh)

765

432

AWUPR[7:0]

R/W

Table 23.

AWUPR register description

Bit

Name

Function

7:0 AWUPR[7:0]

Auto Wake-up Prescaler

These 8 bits define the AWUPR division factor (as explained below).

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

stays in Halt mode before waking up automatically.

Note: If 00h is written to AWUPR, depending on the product, an interrupt is

generated immediately after a HALT instruction, or the AWUPR remains

unchanged.

Table 24.

AWUPR division factors

AWUPR[7:0]

Division factor

00h

Forbidden

01h

...

FEh

254

FFh

255

AWU

AWUPR

AWURC

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

RCSTRT

Table 25.

AWU register map and reset values

Address (Hex.) Register label

4321

004Ah

AWUCSR

Reset value

AWUF

AWUM

AWUEN

0049h

AWUPR

Reset value

AWUPR7

AWUPR6

AWUPR5

AWUPR4

AWUPR3

AWUPR2

AWUPR1

AWUPR0

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