HT82K75R datasheet(29/66 Pages) HOLTEK

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HT82M75R/HT82M75RE

HT82K75R/HT82K75RE

Rev. 1.10

June 11, 2010

Bit No.

Func. Name

R/W

Description

CNT_WK

0: MCU wakeup not by period counter

1: MCU wakeup by period counter overflow (Read only)

DC_Ctrl

R/W

This bit is used to decide whether the DC block is in operation

0: enable DC_DC output (default)

1: disable DC_DC output

2.2 Low

Battery

Flag for 2.2V battery low signal coming from DC/DC block (error

±5%)

0: battery voltage > 2.2 or 2.0V

1: battery voltage

£ 2.2 or 2.0 V

Clock_div

R/W

00: CLK/1=6MHz (default)

01: CLK/2=3MHz

10: CLK/4=1.5MHz

11: CLK/4=1.5MHz

LVD_Set

R/W

LVD detect voltage select

000: 1.8V

001: 2.0V

010: 2.2V (default)

011: 2.5V

100: 2.8V

Control Register CTLR

Period Timer Register

- PTR

This register is used to define the period of the timer which always counts in the Power Down mode. Once the timer is

reached, the MCU will be woken-up by Period Timer Register overflow. Once the MCU is woken-up by the period timer,

the CNT_WK bit of the wake-up Register is set to

²1².

Bit No.

Function

Name

R/W

Description

0~7

Period Timer

R/W

The Period Timer is the time interval generator with one second as a unit. If

the bits [7:0] are equal to 00H, the MCU will be woken up by one of the

wake-up source mentioned in Wake-up Section except the PTR overflow

event. If the bits [7:0] are not equal to 00H, the MCU will be woken up from

the Power Down mode by the following events except WDT overflow event:

· I/O Port wake-up

· INT wake-up

· Reset

· The Period Timer is reached to the values specified by the PTR.

Period Timer Register

- PTR

W S 2

W D T S R e g i s t e r

b 7

b 0

W D T p r e s c a l e r r a t e s e l e c t

W S 2

W S 1

W S 0

W D T R a t e

W D T i s d i s a b l e d

1 : 1

1 : 4

1 : 8

1 : 1 6

1 : 3 2

1 : 6 4

1 : 1 2 8

N o t u s e d

W S 1 W S 0

Watchdog Timer Register

HT82K75R 数据表(PDF) 29 Page - Holtek Semiconductor Inc

HT82K75R 数据表(HTML) 29 Page - Holtek Semiconductor Inc

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