ht82k73e Holtek Semiconductor Inc., ht82k73e Datasheet - Page 27

• Manufacturer Part Number: ht82k73e
• Description: 2.4ghz Keyboard 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 .
Application Circuits
DC/DC Section
This circuit is used to generate a stable DC_out (2.8,
3.1, 3.4, 3.8, 4.1, 4.6V use OTP option error 5%) power
voltage for whole IC and output to the IRPT. The clock of
DC/DC is 140kHz. Also it can detector the battery volt-
age. If the battery voltage down to 2.2V or 2.0V LVD (er-
ror 0.1V), it output a Low signal (2.2 or 2.0 low battery)
to MCU. Also there are 2.4V LVR (DC_out), the LVR is
detect the DC_out voltage. When the DC_out down to
2.4V, 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 PG0=0, and MCU in halt mode, the LVR is
no effect on MCU no matter the LVR option is enable or
disable.
Rev. 1.00
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
27
DC/DC output current in normal state= 100mA for 2.2V
Make sure the battery= 2.2V or 2.0 V, the DC/DC is work
properly.
For Battery-in is 2.2V, the output driving current has
mini. 50mA.
Description
HT82K73E
April 16, 2008