HT817D0 データシートの表示（PDF） - Holtek Semiconductor

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HT817D0

16.8-Second LOG-PCM Speech

Holtek Semiconductor 

¨ Reset of KEY1 playing sequence

If a sub-group of KEY1is playing and one of

KEY2~KEY12 is triggered, the playing

sub-group will be terminated, and the newly

triggered key group come into play instead.

The first sub-group will start playing by

retriggering KEY1. In other words, the KEY1

playing sequence is reset whenever a key

other than KEY1 is triggered (see Figure 1).

¨ Sub-group selection

When KEY1 is triggered with pulses, a de-

sired sub-group can be selected by controlling

its corresponding pulse number. However,

the features of KEY1 have to be set in the fol-

lowing ways:

- sequential or random

- retriggerable

- minimum key debounce time

(@700ms, fOSC=96kHz)

For instance, if sub-group 1-3 is the previous

playing group, sub-group 1-5 will start playing

after 2 pulses are input to KEY1, and so on.

To make easy selection of KEY1 sub-groups,

one of KEY2~KEY12 should be programmed

as silence. Then this silence key has to be

triggered to reset KEY1. By so doing, the

playing sub-group of KEY1 is directly speci-

fied by the pulse number applied to KEY1

(see Figure 2).

· KEY12 as a stop key (by mask option)

When KEY12 functions as a stop key, any

voice output can be stopped by pressing

KEY12.

· KEY1~KEY11 as a repeat key

KEY1~KEY11 all function as repeat key if

one of the eleven keys is set as a repeat key. In

other words, once the mode of one of

KEY1~KEY11 is determined, the remaining

10 keys are set accordingly.

As a repeat key, the sections included can be

played sequentially and repeatedly till other

key input is triggered. KEY12 has no other

choice but functions as a stop key when

KEY1~KEY11 are set as repeat keys.

HT817D0

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 the sys-

tem 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

8

March 15, 2000

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