HT819D0 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT819D0

4.2 Second LOG-PCM Speech

Holtek Semiconductor 

HT819D0

but functions as a stop key when KEY1~KEY5

are set as repeat keys.

Key features

• Key priority

When two or more keys are triggered simulta-

neously, the output voice is determined by the

key priority as shown below:

KEY1>KEY2>......KEY5>KEY6

• Key debounce time

There are four kinds of key-in debounce time

that can be selected by mask option, namely,

700µs, 22ms, 45ms and 180ms. The key de-

bounce time varies with the value of the system

frequency.

• Pull-high resistance

Four kinds of key input pin pull-high resis-

tance can be selected by mask option,

namely, 20kΩ, 50kΩ, 100kΩ and 200kΩ.

The resistance may vary with VDD, tem-

peratures and the chip itself due to process

variations.

• Trigger mode

All of the six keys are internally set as one-

shot trigger mode.

FLAG

When voices are playing, both FLAG1 and

FLAG2 pins are activated to output one of the

following signals through code option.

FLAG1 can be optioned as one of the following

signal outputs:

None, 3HzB flash, Busy, 6HzB flash, Voice indica-

tor, or End-pulse output

FLAG2, on the other hand, can be set as one of

the following signal outputs:

None, 3Hz flash, 6Hz flash, or Busy output

• 3Hz/3HzB flash

When voices are playing, the FLAG1 as well

as FLAG2 pin outputs a 3Hz signal to drive an

LED. The signal is active low, 25% duty. Once

the voice output is terminated, the FLAG1

and FLAG2 pins become floating outputs.

When the FLAG1 and FLAG2 pins are op-

tioned as 3HzB and 3Hz outputs, they will be

alternately output at a 3Hz rate.

• 6Hz/6HzB flash

When voices are playing, the FLAG1 as well as

FLAG2 pin outputs a 6Hz signal to drive an

LED. The signal is active low, 25% duty. Once

the voice output is terminated, the FLAG1 and

FLAG2 pins becomes floating outputs. When

the FLAG1 and FLAG2 pins are optioned as

6HzB and 6Hz outputs, they will be alter-

nately output at a 6Hz rate.

• Busy output

When a voice group is playing, the outputs of

both FLAG1 and FLAG2 are turned low, indi-

cating that the chip is busy.

In addition to the above-stated output signals,

FLAG1 can also generate one of the following

signals by code option:

7

6th May ’98

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