HT45R34 datasheet(19/41 Pages) HOLTEK

19 / 41 page

HT45R34

Rev. 1.20

October 15, 2007

The relationship between VDD and VLVR is shown below.

Note:

VOPR is the voltage range for proper chip operation at 4MHz system clock.

5 . 5 V

3 . 0 V

2 . 2 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 starting the normal operation.

*2: Since low voltage has to be maintained its original state for longer than tLVR, therefore a tLVR delay enters

the reset mode.

Options

The following table shows the various options within the microcontroller. All of the options must be defined to ensure

proper system functioning.

No.

Function

Description

Wake up PA0~PA7 (bit option)

None wake-up or wake-up

Pull high PA0~PA7 (bit option)

None pull-high or pull-high

WDT clock source

WDTOSC or fSYS/4

WDT

Enable or disable

CLRWDT

1 or 2 instructions

LVR

Enable or disable

OSC

¢tal mode or RC mode

INT0 trigger edge

Disable, rising edge, falling edge or double edge

INT1 trigger edge

Disable, rising edge, falling edge or double edge

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