HT819D0 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT819D0

4.2 Second LOG-PCM Speech

Holtek Semiconductor 

HT819D0

As indicated on the table, KEY1 can be made

up of sub-groups. Each time KEY1 is trig-

gered, the corresponding sub-groups are

played in sequence.

♦ 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~KEY6 is triggered, the

playing sub-group will be terminated, and

the newly triggered key group is played in-

stead. The first sub-group will start playing

when KEY1 is retriggered. 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, the 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

(≅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 easy selection of KEY1 sub-groups,

one of KEY2~KEY6 should be programmed as

silence. Then this silence key has to be trig-

gered to reset KEY1. By so doing, the playing

sub-group is directly specified by the pulse

number applied to KEY1 (see Figure 2).

• KEY6 as a stop key (by mask option)

When KEY6 functions as a stop key, any voice

output can be stopped by pressing KEY6.

• KEY1~KEY5 as a repeat key

KEY1~KEY5 all function as a repeat key if

one of the 5 keys is set as a repeat key. In other

words, once the mode of one of KEY1~KEY5

is determined, the remaining four keys are set

accordingly.

As a repeat key, the sections included can be

played sequentially and repeatedly till key

input is triggered. KEY6 has no other choice

Figure 1 Reset of KEY1 playing sequence

Figure 2 KEY1 sub-group selection

6

6th May ’98

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