HT48R30A datasheet(20/43 Pages) HOLTEK

20 / 43 page

HT48R30A-1

Rev. 1.10

July 2, 2001

The PG0 is pin-shared with INT.

In case of ²Internal RC+I/O² system oscillator,

the PG1 and PG2 are pin-shared with OSC1

and OSC2 pins. Once the ²Internal RC+I/O²

mode is selected, the PG1 and PG2 can be used

as general purpose I/O lines. Otherwise, the

pull-high resistors and I/O functions of PG1

and PG2 will be disabled.

It is recommended that unused or not bonded

out I/O lines should be set as output pins by

software instruction to avoid consuming power

under input floating state.

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 automatically 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 func-

tion.

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

ternal 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

PA 0 ~ P A 7

PB 0 ~ P B 7

PC 0 ~ PC 5

PG 0 ~ P G 2

EX T E N

( P B0 , PB 1 O nl y )

OP 0 ~ OP 7

IN T fo r P G 0 O nl y

S y s t em W ak e- up

(P A o nl y )

R ead D a t a R egi s t er

PB 0

EX T

( P B0 , PB 1 O nl y )

C o ntr o l B i t

Da t a B u s

W r i t e C o nt r ol R egi s t er

C h i p R es et

R ead C o nt r ol R eg i s t e r

W r i t e D a t a R egi s t er

Da t a B i t

E X T = B Z f or P B 0 o nl y , E X T = B Z f o r P B 1 onl y , c on t r ol = P B 0 d at a r egi s t er

P G 1/ P G 2 I / O m ode onl y

Input/output ports

HT48R30A Scheda tecnica(PDF) 20 Page - Holtek Semiconductor Inc

HT48R30A Scheda tecnica(HTML) 20 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

Scheda tecnica Scarica

Link URL