ht82m99e Holtek Semiconductor Inc., ht82m99e Datasheet - Page 16

• Manufacturer Part Number: ht82m99e
• Description: Ht82m99e/ht82m99a -- Usb Mouse Encoder 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

Low Voltage Reset - LVR
The microcontroller contains a low voltage reset circuit
in order to monitor the supply voltage of the device. If the
supply voltage of the device drops to within the range of
0.9V~V
tery, the LVR will automatically reset the device inter-
nally.
The LVR includes the following specifications:
Note: *1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
Rev. 2.20
For a valid LVR signal, a low voltage (0.9V~V
exist for more than 1ms. If the low voltage state does
not exceed 1ms, the LVR will ignore it and will not per-
form a reset function.
The LVR uses the OR function with the external
RES signal to perform a chip reset.
*2: A low voltage has to exist for more than 1ms, after that 1ms delay, the device enters a reset mode.
LVR
clock pulses before entering the normal operation.
such as might occur when changing the bat-
LVR
Low Voltage Reset
) must
16
The relationship between V
Note: V
tion at 6MHz or 12MHz system clock.
OPR
is the voltage range for proper chip opera-
HT82M99E/HT82M99A
DD
and V
LVR
is shown below.
April 16, 2008