ST72561K6-Auto datasheet(71/324 Pages) STMICROELECTRONICS

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ST72561-Auto

Power saving modes

Doc ID 12370 Rev 8

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7.6.1

AWUFH control/status register (AWUCSR)

Read/Write (except bit 2 read only)

Reset value: 0000 0000 (00h)

Bits 7:3 = Reserved.

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.

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 ICAP1 input of the 16-

bit 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 AWUPR register.

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 defined by 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:

AWUF

AWUM

AWUEN

AWUPR7

AWUPR6

AWUPR5

AWUPR4

AWUPR3

AWUPR2

AWUPR1

AWUPR0

Table 23.

AWUPR prescaler

AWUPR[7:0]

Dividing factor

00h

Forbidden (See note)

01h

...

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