ht82m73e Holtek Semiconductor Inc., ht82m73e Datasheet - Page 25

• Manufacturer Part Number: ht82m73e
• Description: 2.4ghz Mouse Tx 8-bit Otp Mcu
• Manufacturer: Holtek Semiconductor Inc.

Period Timer Register - PTIMER
This register is used to define the period of the timer which always counts in the Suspend mode. Once the timer is
reached, the MCU will be woken-up by the I/O method. Once the MCU is woken-up by the period timer, the CNT_WK
bit of the wake-up Register is set to 1 .
DC_DC Section
This circuit is used to generate a stable 3.3V (error
IRPT. The clock of DC/DC is 140kHz. Also it can detec-
tor the battery voltage , If the battery voltage down to
2.2V LVD (error 0.1V), it output a Low signal (2.2 Low
battery) to MCU . Also there are 2.4V LVR (DC_DC out-
put=3.3V), the LVR is detect the DC_3.3 voltage. When
the DC_3.3 down to 2.4, the MCU will reset (there are
one OTP option to decide whether this function is on or
off). Also if DC_DC is disable by PC7=0, and MCU in
halt mode, the LVR is no effect on MCU no matter the
LVR option is enable or disable.
DC/DC output current in normal state=50mA for 2.2V
Rev. 1.00
0.1V) power voltage for whole IC and output to the
Bit No.
0~7
Period Timer
Function
Name
R/W
R/W
The time interval, one seconds as a unit.
When <7:0>=0H then the Hardware motion detector will only wake-up the
MCU when it detects mouse movement or when there is a button change
for the mouse mode. For the I/O mode, MCU will only be woken up by a Port
I/O or an INT when <7:0>=0H, otherwise the MCU can be woken up from
the suspend mode by the following conditions:
I/O Port wake-up
RC watchdog is reached when the MCU is configured as RC watchdog
enable OTP option
INT wake-up
Reset
The period of the Period Timer Register is reached.
Period Timer Register
25
Make sure the battery=2.2V, the DC/DC is work prop-
erly.
Where LVD_Rd is the control signal of the DC/DC to
check what is the battery voltage. In order to read 2.2
LVD signal correctly, the user must wait about 5 s after
set LVD_Rd and then read the 2.2 LVD signal.
For Battery-in is 2.2V, the output driving current has
mini. 50mA
Description
HT82M73E
May 14, 2008