ht82k68e-l Holtek Semiconductor Inc., ht82k68e-l Datasheet - Page 15

• Manufacturer Part Number: ht82k68e-l
• Description: Ht82k68e-l/ht82k68a-l -- Multimedia Keyboard Encoder 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

Low Voltage Reset - LVR
The microcontroller provides low voltage reset circuit in
order to monitor the supply voltage of the device. If the
supply voltage of the device is within the range
0.9V~V
tomatically reset the device internally.
The LVR includes the following specifications:
Note:
Rev. 1.10
The low voltage (0.9V~V
original state to exceed 1ms. If the low voltage state
does not exceed 1ms, the LVR will ignore it and do not
perform a reset function.
The LVR uses the OR function with the external
RES signal to perform chip reset.
The relationship between V
below.
LVR
*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
*2: Since low voltage has to be maintained in its original state and exceed 1ms, therefore 1ms delay enters the
such as changing a battery, the LVR will au-
clock pulses before entering the normal operation.
reset mode.
LVR
) has to remain in their
DD
and V
LVR
is shown
Low Voltage Reset
15
The relationship between V
Note:
V
operation at 4MHz system clock.
OPR
is the voltage range for proper chip
HT82K68E-L/HT82K68A-L
DD
and V
LVR
is shown below.
April 2, 2008