ST72340 datasheet(51/191 Pages) STMICROELECTRONICS

51 / 191 page

ST72340, ST72344, ST72345

51/191

POWER SAVING MODES (Cont’d)

9.6.0.1 Register Description

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 con-

nects internally its output to the ICAP2 input of 16-

bit timer A. 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 fea-

ture: once HALT mode is entered, the AWUFH

wakes up the microcontroller after a time delay de-

fined by the AWU prescaler value. It is set and

cleared by software.

0: AWUFH (Auto Wake Up From Halt) mode disa-

bled

1: AWUFH (Auto Wake Up From Halt) mode ena-

bled

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 33) 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.

Table 10. AWU Register Map and Reset Values

000

AWU

PR7

AWU

PR6

AWU

PR5

AWU

PR4

AWU

PR3

AWU

PR2

AWU

PR1

AWU

PR0

AWUPR[7:0

]

Dividing factor

00h

Forbidden (See note)

01h

...

FEh

254

FFh

255

AWU

AWUPR

AWURC

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

RCSTRT

Address

(Hex.)

Label

76543

210

002Eh

AWUCSR

Reset Value

00000

AWUF

AWUM

AWUEN

002Fh

AWUPR

Reset Value

AWUPR7

AWUPR6

AWUPR5

AWUPR4

AWUPR3

AWUPR2

AWUPR1

AWUPR0

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