HT9302 datasheet(8/27 Pages) HOLTEK

8 / 27 page

HT9302 Series

Rev. 1.20

September 30, 2002

Pulse number table

Keypad

Output Pulse Number

Digit Key

Normal N

New

Zealand

(10

-N)

Sweden/

Denmark

(N+1)

010

*/T

®TP®TP®T

Ignored

Hand-free function operation

· Hand-free function execution

When HFO is low, a rising edge triggers the HFI, en-

abling the Hand-free function (HFO becomes high).

· Reset Hand-free function

When HFO is high, the Hand-free function is enabled

and can be reset by:

¨ Off-hook

¨ Applying a rising edge to HFI

¨ Changing the HDO pin from low to high

· Hand-free function table

Hold-line function operation

· Hold-line function execution

When HDO is low, a falling edge triggers the HDI,en-

abling the Hold-line function (HDO becomes high).

The XMUTE remains low when HDO is high.

· Reset Hold-line function

When HDO is high, the Hold-line function is enabled

and can be reset by:

¨ Off-hook

¨ Applying a falling edge to HDI

¨ Changing the HFO pin from low to high

· Hold-line function table

DOUT BCD code

When dialing, the corresponding 4-bit BCD codes are

serially presented on DOUT from MSB to LSB. The data

of DOUT is valid at the falling edge of the CLOCK pin.

The following table lists the BCD codes corresponding

to the keyboard input.

Key-In

BCD Code

Key-In

BCD Code

0001

1000

0010

1001

0011

1010

0100

*/T

1101

0101

1100

0110

1011

0111

1110

C u r r e n t S t a t e

I n p u t

N e x t S t a t e

H K S

H . O

H D O

H . I

H K S

A n

H . O

A n

H D O

A n

H D I

H :

L :

L o g i c H I G H

L o g i c L O W

X :

A n :

D o n ' t c a r e

U n c h a n g e d

R i s i n g e d g e

. a l l i n g e d g e

C u r r e n t S t a t e

I n p u t

N e x t S t a t e

H K S

H D O

H . O

H D I

H K S

A n

H D O

A n

H . O

A n

H . I

H :

L :

L o g i c H I G H

L o g i c L O W

X :

A n :

D o n ' t c a r e

U n c h a n g e d

R i s i n g e d g e

. a l l i n g e d g e

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