ST7FOXU0 datasheet(57/123 Pages) STMICROELECTRONICS

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ST7FOXU0

Power saving modes

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8.5.3

AWUFH Prescaler Register (AWUPR)

Reset value: 1111 1111 (FFh)

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

These 8 bits define the AWUPR Dividing factor (see Table 13).

In AWU mode, the time during which the MCU stays in Halt mode, tAWU, is given by the

equation below. See also Figure 25 on page 54.

The AWUPR prescaler register can be programmed to modify the time during which the

MCU stays in Halt mode before waking up automatically.

Note:

If 00h is written to AWUPR, the AWUPR remains unchanged.

AWUPR7

AWUPR6

AWUPR5

AWUPR4

AWUPR3

AWUPR2

AWUPR1

AWUPR0

Read/Write

Table 13.

Configuring the dividing factor

AWUPR[7:0]

Dividing factor

00h

Forbidden

01h

...

FEh

254

FFh

255

AWU

AWUPR

AWURC

--------------------

RCSTRT

Table 14.

AWU register mapping and reset values

Address

(Hex.)

label

6543

210

0048h

AWUCSR

Reset

Value

0000

AWUF

AWUM

AWUEN

0049h

AWUPR

Reset

Value

AWUPR7

AWUPR6

AWUPR5

AWUPR4

AWUPR3

AWUPR2

AWUPR1

AWUPR0

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