HT82K68 データシートの表示（PDF） - Holtek Semiconductor

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HT82K68

Multimedia Keyboard Encoder 8-Bit MCU

Holtek Semiconductor 

HT82K68E-L/HT82K68A-L

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~VLVR such as changing a battery, the LVR will au-

tomatically reset the device internally.

The LVR includes the following specifications:

· The low voltage (0.9V~VLVR) has to remain in their

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 ²OR² function with the external

RES signal to perform chip reset.

The relationship between VDD and VLVR is shown

below.

The relationship between VDD and VLVR is shown below.

V DD

V O PR

5 .5 V 5 .5 V

V LV R

2 .0 V 2 .0 V

Note:

0 .9 V

VOPR is the voltage range for proper chip

operation at 4MHz system clock.

V DD

5 .5 V

V LV R

0 .9 V

0V

R e s e t S ig n a l

L V R D e te c t V o lta g e

R eset

N o r m a l O p e r a tio n

R eset

*1

*2

Low Voltage Reset

Note:

*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system

clock pulses before entering the normal operation.

*2: Since low voltage has to be maintained in its original state and exceed 1ms, therefore 1ms delay enters the

reset mode.

Rev. 1.40

15

February 1, 2011

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