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

♦ The playing sequence of sequential KEY1 is:

Group 1-1 → Group 1-2 → Group 1-3 ..... →

Group 1-N (the last group) → Group 1-1 .....

♦ The playing sequence of random KEY1 is:

Group 1-3 → Group 1-5 ..... → Group 1-N →

Group 1-3 → Group 1-5 .....

That KEY1 functions as a random key is a

special case of sequential key, which combines

a particular arrangement of sub-group play-

ing sequence.

♦ Reset of KEY1 playing sequence

If a sub-group of KEY1 group is being played

and one of KEY2~KEY8 is triggered, the

playing sub-group will be terminated, and

the newly triggered key group come is played

instead. The first sub-group will start play-

ing by retriggering KEY1. In other words,

the KEY1 playing sequence is reset when-

ever 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 follow-

ing ways:

– sequential or random

– retriggerable

– minimum key debounce time

(≅700µs, 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 applied to KEY1, and so on.

To make selection of KEY1 sub-groups more

easily, one of KEY2~KEY8 should be pro-

grammed 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).

• KEY8 as a stop key (by mask option)

When KEY8 functions as a stop key, any voice

output can be stopped by pressing KEY8.

• KEY1~KEY7 as a repeat key

KEY1~KEY7 all function as repeat key if one

of the seven keys is set as a repeat key. In

other words, once the mode of one of

KEY1~KEY7 is determined, the remaining

six keys are set accordingly.

As a repeat key, the sections included can be

played sequentially and repeatedly till other

key input is triggered. KEY8 has no other

choice but functions as a stop key when

KEY1~KEY7 are set as repeat keys.

Figure 1 Reset of KEY1 playing sequence

Figure 2 KEY1 sub-group selection

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5th May ’98

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