HT812D0 datasheet(7/15 Pages) HOLTEK

Part #	HT812D0

Description	2.8 Second LOG-PCM Speech

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Manufacturer	HOLTEK [Holtek Semiconductor Inc]

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When KEY1~KEY3 are set as repeat keys, the

key function should be optioned as retrigger-

able keys.

Key features

• Key priority

When two or more keys are triggered simulta-

neously, the output voice is decided by the key

priority as shown below:

KEY1>KEY2>KEY3>KEY4

• Key debounce time

There are four kinds of key-in debounce time to

be selected by mask option, namely, 700

µs, 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, 20k

Ω, 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 four keys can be optioned as one-

shot trigger mode or level-trigger mode.

♦ One shot

When one of the four keys (KEY1~KEY4) is

pressed and held down, the group corre-

sponding to that held key will play once. The

corresponding group will also play once

when one of the four keys is pressed momen-

tarily.

♦ Level trigger

When one of the four 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.

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, 3Hz flash, Busy, 6Hz flash, Voice indicator,

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 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, FLAG1 and

FLAG2 pins become floating outputs. When

FLAG1 and FLAG2 pins are optioned as 3Hz

output, they will be alternately signaled at a

3Hz rate output.

• 6Hz 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 6Hz out-

put, they will be alternately signaled at a 6Hz

rate output.

HT812D0

7

5th May ’98

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