HT82M75REW/HT82K75REW
Rev. 1.00
32
June 11, 2010
Bit No.
Func. Name
R/W
Description
0
CNT_WK
R
0: MCU wakeup not by period counter
1: MCU wakeup by period counter overflow (Read only)
1
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
2.2 Low
Battery
R
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
3
4
Clock_div
R/W
00: CLK/1=6MHz (default)
01: CLK/2=3MHz
10: CLK/4=1.5MHz
11: CLK/4=1.5MHz
5
6
7
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
²
1
²
.
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
0
0
0
0
1
1
1
1
W S 1
0
0
1
1
0
0
1
1
W S 0
0
1
0
1
0
1
0
1
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
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