HT46R23 datasheet(19/42 Pages) HOLTEK

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HT46R23

Rev. 1.30

August 17, 2001

000B

100B

010B

* 76 T A D

100B

000B

* * X X X B

ST AR T

EO C

PC R 0 ~ P C R 2

AC S0 ~ A C S 2

Po w e r

Re s e t

S t ar t of A / D

conv er s i on

Re s e t A / D

conv er t e r

S t ar t of A / D

conv er s i on

Re s e t A / D

conv er t e r

E nd of A / D

conv er t e r

E nd of A / D

conv er t e r

1: D e f i ne P B co n f i gur a t i o n

2: S el ect anal og cha nnel

** *3 : S e l e ct A D C cl o ck

( E x a m p l e : 4 channel , A N 2,

f SY S /8 )

1: A l l P B l i ne i s d i g i t al i nput

2 : A / D con v e r t er i s po w e r o f f

t o r educe pow er cons um p t i o n

* 76 T A D

" * " A / D conv er t i ng t i m e i s 7 6 T A D

" * * " X X X B m eans d on' t car e

" * * * " A D C cl o ck m u st b e f SY S /2 , f SY S /8 , f SY S /3 2

No t e :

A/D conversion timing

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~3.3V, 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~3.3V) 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

operation at 4MHz system clock.

5. 5V

3. 3V

3. 0V

0. 9V

V DD

V OP R

V LV R

5. 5V

V DD

5. 5V

V LV R

0. 9V

R e s e t S i gnal

Re s e t

N o rm a l O p e ra t i o n

R e s e t

LV R D e t e ct V ol t age

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 state has to be maintained in its original state for over 1ms, therefore after 1ms delay,

the device enters the reset mode.

HT46R23 Datasheet(PDF) 19 Page - Holtek Semiconductor Inc

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