HT813D0 データシートの表示（PDF） - Holtek Semiconductor

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HT813D0

5.6 Second LOG-PCM Speech

Holtek Semiconductor 

HT813D0

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>......KEY7>KEY8

• Key debounce time

There are four kinds of key-in debounce time to

be selected by mask option, namely, 700µs, 22ms,

45ms and 180ms. The key debounce 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 eight keys can optioned as one-shot

trigger mode or level-trigger mode.

♦ One shot

When one of the eight keys (KEY1~KEY8)

is pressed momentarily or held down, the

group corresponding to that key will play

once.

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, 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 the FLAG2 pins are

optioned as 3HzB and 3Hz output, they will

be alternately output at a 3Hz rate.

♦ Level trigger

When one of the eight keys is pressed and

held down, the corresponding group will

keep playing. Once the pressed key is re-

leased, the group will not stop till the in-

cluded sections are all completed.

• 6Hz/6HzB flash

When voices are playing, the FLAG1 pin

outputs a 6Hz signal to drive an LED. The

signal is active low, 25% duty. Once the voice

output is terminated, the FLAG1 pin be-

comes a floating output. When the FLAG1

and the FLAG2 pins are optioned as 6HzB

and 6Hz outputs, they will be alternately

output at a 6Hz rate.

7

5th May ’98

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