HT818D0 データシートの表示（PDF） - Holtek Semiconductor

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HT818D0

22.4-Second LOG-PCM Speech

Holtek Semiconductor 

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>......KEY11>KEY12

· Key debounce time

There are four kinds of key-in debounce time

that can be selected by mask option, namely

700ms, 22ms, 45ms and 180ms. The key

debounce time varies with the value of system

frequency.

· Pull-high resistance

Four kinds of key input pin pull-high resis-

tance can be selected by mask option,

namely, 20kW, 50kW, 100kW and 200kW.

The resistance may vary with VDD, tem-

peratures and the chip itself due to process

variations.

· Trigger mode

All of the 12 keys can be optioned as one-shot

trigger mode, level hold mode or level-trigger

mode.

¨ One shot

When one of the 12 keys (KEY1~KEY12) is

pressed momentarily or held down, the

group corresponding to that key will play

once.

KEY N

AUD

G ro u p N

G ro u p N

¨ Level trigger

When one of the 12 keys is pressed and held

down, the corresponding group will keep

playing. Once the pressed key is released,

the group will not stop till the included sec-

tions are all completed.

KEY N

AUD

G ro u p N G ro u p N G ro u p N

HT818D0

* Level hold

When one of the 12 keys is pressed and held

down, the group corresponding to that held

key will play until the pressed key is re-

leased, then the group will immediately

stop regardless of the rest.

KEY N

AUD

G ro u p N G ro u p N G ro u p N

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 out-

puts. When the FLAG1 and the FLAG2 pins

are optioned as 3HzB and 3Hz outputs, they

will be alternately output at a 3Hz rate.

AUD

FLA G

: F lo a tin g

8

March 15, 2000

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