HT812D0 datasheet(5/15 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 the code op-

tion.

• 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 keep on playing till

the whole section is completed, whether or not

there is a key input during voice playing.

For a key group, some sections 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 a non-retrig-

gerable section is playing, any key interrupt

is invalid.

Group

The HT812D0 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 immediately. For ex-

ample, triggering 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 of one group only.

Key function table

Sections in the 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 124–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 on the above table, the voice

ROM is composed of 5 sections, and as a whole

comprise 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 3 keys (KEY2~KEY4)

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

HT812D0

5th May ’98

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