HT9320 datasheet(13/30 Pages) HOLTEK

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HT9320

July 21, 1999

Pulse number table

Keypad

Output Pulse Number

Digit Key

10-N

N+1

010

*/T

P®TP®TP®T

Ignored

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

On hook store (HT9320A/H)

When the external power supply (2V~5.5V) is

used and the HST pin is connected to VDD, the

user can store dialing numbers to the memories

(M1~M20) during on-hook state.

On/Off hook store selection table

HST Pin

Hook Store Mode

VDD (HT9320A/H)

On-hook store

Floating (HT9320A)

Off-hook store

VSS (HT9320H)

Off-hook store

Lock function (HT932L)

This function aims to detect lock dialing num-

bers to prevent from an unauthorized long dis-

tance call. The dialing output of this chip is

disabled if the first input key after on-off hook is

the lock number when the lock function is en-

abled.

International direct dialing lock (IDD lock) se-

lection table

RK51 RK61 RK71

Lock Function

No Normal dialing without

lock function

Yes To lock 0

Yes

To lock 0, 9

Yes

¾¾

IDD lock operation by the

telephone keyboard.

(See keyboard operation)

Note: ²¾² stands for ²don¢t care²

Hand-free function operation

· Hand-free function execution

When HFO is low, a rising edge triggers the

HFI, enabling 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

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