HT46R47 datasheet(21/45 Pages) HOLTEK

21 / 45 page

HT46R47

Rev. 1.40

July 18, 2001

When the A/D conversion is completed, the A/D

interrupt request flag is set. The EOC bit is set

to ²1² when the START bit is set from ²0² to ²1².

Bit

ADRL

D0 ¾¾¾¾¾¾¾

ADRH

D8 D7 D6 D5 D4 D3 D2 D1

* D0~D8 is A/D conversion result data bit

LSB~MSB.

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 automatically 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 func-

tion.

· The LVR uses the ²OR² function with the exter-

nal 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.

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 a r t o f A /D

c onv er s i on

Re s e t A / D

c onv er t e r

S t a r t o f A /D

c onv er s i on

Re s e t A / D

c onv er t e r

E nd of A / D

c onv er t e r

E nd of A / D

c onv er t e r

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

2: S el ec t anal og c h a nnel

** *3 : S e l e c t A D C c l o c k

( E x a m p l e : 4 c hannel , 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 c o n v e r t e r i s p o w e r o f f

t o r educ e pow er c ons um p t i o n

* 76 T A D

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

" * * " X X X B m eans d on' t c a r 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 :

5. 5V

3. 3V

3. 0V

0. 9V

V DD

V OP R

V LVR

5. 5V

HT46R47 Datasheet(PDF) 21 Page - Holtek Semiconductor Inc

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