HT48CU80 Holtek Semiconductor, HT48CU80 Datasheet - Page 21

• Manufacturer Part Number: HT48CU80
• Description: (HT48RU80 / HT48CU80) I/O Type 8-Bit MCU
• Manufacturer: Holtek Semiconductor

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Low Voltage Reset - LVR
The microcontroller provides a 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:
Rev. 1.00
The low voltage (0.9V~V
nal state for longer than 1ms. If the low voltage state
does not exceed 1ms, the LVR will ignore it and will
not perform a reset function.
The LVR uses an OR function with the external RES
signal to perform a chip reset.
LVR
, such as changing a battery, the LVR will au-
LVR
) has to remain in its origi-
PC1/RX Input/Output Ports
PC0/TX Input/Output Ports
21
The relationship between V
Note: V
tion at 4MHz system clock.
OPR
is the voltage range for proper chip opera-
HT48RU80/HT48CU80
DD
and V
LVR
is shown below.
April 12, 2006