ST7FL15F1MATRE datasheet(42/138 Pages) STMICROELECTRONICS

42 / 138 page

ST7L15, ST7L19

42/138

POWER SAVING MODES (cont’d)

9.6.0.1 Register Description

AWUFH CONTROL/STATUS REGISTER

(AWUCSR)

Read/Write

Reset Value: 0000 0000 (00h)

Bits 7:3 = Reserved.

Bit 1 = 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

This bit enables the AWU RC oscillator and con-

nects its output to the input capture of the 12-bit

Auto-Reload timer. This allows the timer to meas-

ure 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

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-

pendent on 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 27 on page 40) is de-

fined 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 7. AWU Register Map and Reset Values

00000

AWUF AWUM AWUEN

AWUP

AWUPR[7:0

]

Dividing factor

00h

Forbidden

01h

...

FEh

254

FFh

255

AWU

AWUPR

AWURC

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

RCSTRT

Address

(Hex.)

Label

765

4321

0049h

AWUPR

Reset Value

AWUPR7

AWUPR6

AWUPR5

AWUPR4

AWUPR3

AWUPR2

AWUPR1

AWUPR0

004Ah

AWUCSR

Reset Value

AWUF

AWUM

AWUEN

ST7FL15F1MATRE 数据表(PDF) 42 Page - STMicroelectronics

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