HT813D0 datasheet(5/12 Pages) HOLTEK

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The following are examples of section division:

In addition, a section can be set as retriggerable

or non-retriggerable depending on code option.

• Retriggerable

When the currently playing section is set as

retriggerable, it will stop immediately upon

receipt of other key inputs.

• Non-retriggerable

When the currently playing section is selected

as non-retriggerable, it will go on playing till the

whole section is completed, whether or not there

is a key input in the process of playing.

For a key group, some section(s) can be set as

retriggerable and some as non-retriggerable.

When a retriggerable section of a key group is

playing, any key can be triggered to interrupt its

playing. On the other hand, if it is a non-retrig-

gerable section playing, any key interrupt is

invalid.

Group

The HT813D0 plays groups according to the key

input. A group can be made up of one or more

sections. When a key is triggered, the corre-

sponding group is played. For example, trigger-

ing KEY2 plays group 2, and so on. The same

section is allowed to appear in different groups.

However, KEY1 can be made up of multiple

groups when it is optioned as a sequential or

random key. Otherwise, each key is composed

by one group only.

Key function table

The sections in voice ROM are played according

to the instructions of the key function table. The

function table contains group information and

the playing order of sections in the groups. No-

tice that the total amount of sections included

in the groups should be less than 380–the space

limitation of the function table ROM.

• KEY1 as a direct key

Each key is mapped to a group in the function

table. If a key is not used, the group mapped

to that key is a piece of silence. The following

is an example of the function table:

Group 1

sec.1 + sec.2 + sec.3 + sec.5

Group 2

sec.3

Group 3

sec.2 + sec.2 + sec.3 + sec.4

Group 4

sec.5 + sec.3

As illustrated in the above table, voice ROM

is composed of 5 sections, and 11 sections for

the function table. If KEY1 is momentarily

triggered, section 1, section 2, section 3 and

section 5 are played in sequence and then

stopped. Triggering KEY2 plays section 3, and

so on.

• KEY1 as a sequential or random key

When KEY1 is optioned as a sequential or

random key, KEY1 can include multiple

groups (sub-groups) in the function table.

However, the remaining 7 keys (KEY2~KEY8)

are used as direct keys exclusively and com-

prise only one group in the function table.

An example is shown below:

Group 1-1 sec.4 + sec.2

Group 1-2 sec.1 + sec.3

Group 1-N sec.2 + sec.3

Group 2

sec.2 + sec.3

Group 3

sec.3 + sec.5

Group 4

sec.1 + sec.5 + sec.2

As indicated in the above table, KEY1 can be

made up of sub-groups. The corresponding

sub-groups is played in sequence each time

KEY1 is triggered.

HT813D0

5th May ’98

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