NT91315CL 데이터 시트보기 (PDF) - Novatek Microelectronics

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NT91315CL

Microcontroller for Monitor

Novatek Microelectronics 

NT91315XL Series

Pin Descriptions (continued)

Pin No.

Designation I/O

Description

NT91315AL NT91315BL NT91315CL NT91315DL

(N.A.)

(N.A.)

10

10

HDO

O HOLD output pin

This inverter output pin will stay high when

HOLD function is active

(N.A.)

(N.A.)

11

13

HDI

I The HOLD function will be toggled when this

pin goes from high to low in the OFF HOOK

state

(N.A.)

(N.A)

(N.A.)

12

1

1

1

(N.A.)

18

20

22

KT

HFO

HFI

O Key-in tone output

This N-channel open drain pin sends out a

"beep" tone for each PULSE mode and each

store state key entry, as well as for entries of

accepted function keys (ST, F, A/L, R/P,

SAVE and memory keys). Tone output

frequency is 437 Hz and tone duration is 27

ms

O Hands-Free Control I/O pins These pins

enable and disable the Hands-Free Control

function. When input pin HFI goes low, the

Hands-Free Control state is toggled on. The

status of the Hands-Free Control state is

listed in the following table:

Current

State

Next States

Hook HFO Input HFO Dialing?

sw.

-

Low HFI ↓ High

Yes

I

On High HFI ↓ Low

No

Hook

Off High HFI ↓ Low Yes

Hook

On

- Off Low Yes

Hook

Hook

Off Low On Low No

Hook

Hook

Off High On High Yes

Hook

Hook

9

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