ht82k75rew Holtek Semiconductor Inc., ht82k75rew Datasheet - Page 32

• Manufacturer Part Number: ht82k75rew
• Description: Ht82m75rew/ht82k75rew 2.4ghz Transceiver 8-bit Otp Mcu
• Manufacturer: Holtek Semiconductor Inc.

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 1 .
Rev. 1.00
Bit No. Func. Name R/W
Bit No.
0~7
0
1
2
3
4
5
6
7
CNT_WK
Clock_div
LVD_Set
DC_Ctrl
2.2 Low
Battery
Period Timer
Function
Name
R/W
R/W
R/W
R
R
0: MCU wakeup not by period counter
1: MCU wakeup by period counter overflow (Read only)
This bit is used to decide whether the DC block is in operation
0: enable DC_DC output (default)
1: disable DC_DC output
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
00: CLK/1=6MHz (default)
01: CLK/2=3MHz
10: CLK/4=1.5MHz
11: CLK/4=1.5MHz
LVD detect voltage select
000: 1.8V
001: 2.0V
010: 2.2V (default)
011: 2.5V
100: 2.8V
R/W
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:
Period Timer Register - PTR
I/O Port wake-up
INT wake-up
Reset
The Period Timer is reached to the values specified by the PTR.
Watchdog Timer Register
Control Register CTLR
2.2 or 2.0 V
32
Description
HT82M75REW/HT82K75REW
Description
June 11, 2010