HT82K96E datasheet(18/46 Pages) HOLTEK

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HT82K96E

Rev. 1.70

April 22, 2004

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~V

LVR) 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.

Note:

VOPR is the voltage range for proper chip opera-

tion at 4MHz system clock.

5 . 5 V

3 . 3 V

3 . 0 V

0 . 9 V

V D D

V O P R

V L V R

5 . 5 V

V D D

5 . 5 V

V L V R

0 . 9 V

0 V

R e s e t S i g n a l

R e s e t

* 1

* 2

N o r m a l O p e r a t i o n

R e s e t

L V R D e t e c t V o l t a g e

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.

Mouse Hardware Wake-Up Function

When the HT82K96E is used for USB mouse application, in order to decrease the power consumption of the

HT82K96E in suspend mode. The HT82K96E has built-in Mouse Hardware wake-up function. Once the HT82K96E

jump to suspend mode, and the HWKUPSB (bit7 of SCC) is set to 1. The HT82K96E will automatically switch the IRPT

control pin (PC0) and detect movement of the X1, X2, Y1, Y2, Z1, Z2, corresponding to (PA0~PA5) and the state of the

five button corresponding to PA6, PA7, PB6, PB7, and PD4. Once there are mouse movement or state change. The

HT82K96E will wake-up the MCU by I/O method, otherwise the MCU is in suspend mode.

How long the HT82K96E to turn on the IRPT, and the low pulse period of the PC0 is defined by bit0~3 of the WDTS

(wake-up period) and the bit0~bit2 of the SCC (LED_on period) respectively. The following diagram show the IRPT

control pin timing.

W a k e - u p P e r i o d

L E D _ o n P e r i o d

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