ST7LITE49M datasheet(68/188 Pages) STMICROELECTRONICS

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Power saving modes

ST7LITE49M

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9.5.1

9.5.2

AWUFH Control/Status register (AWUCSR)

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. 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 bit

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

Bit 0 = AWUEN Auto Wake Up From Halt Enabled bit

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.

00000

AWU

AWUM

AWUEN

Read/Write

ST7LITE49M Datasheet(PDF) 68 Page - STMicroelectronics