HT815D0 datasheet(7/15 Pages) HOLTEK

7 / 15 page

HT815D0

March 15, 2000

· 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, the voice ROM

is composed of 5 sections and the function table

of 11 sections. If KEY1 is momentarily trig-

gered, section 1, section 2, section 3 and section

5 are played in sequence and then stops. Trig-

gering KEY2 plays section 3, and so on.

· KEY1 as a sequential or random key

When KEY1 is optioned as a sequential or ran-

dom key, it can include multiple groups

(sub-groups) in the function table. However,

the remaining 11 keys (KEY2~KEY12) are used

as direct keys exclusively and comprise only

one group in the function table. Below is an ex-

ample:

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 are played in sequence each time

KEY1 is triggered.

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 .....

G rou p 1 - N

N p u l s e

G rou p 1- M

M p u l s e

KE Y1

KE Y2 ~ K EY 1 2

( S i l enc e)

AU D

Figure 2 KEY1 sub-group selection

G rou p 1 - 1

G rou p 1 - 2

G rou p 1 - N

G rou p ( 2 ~ 1 2)

G rou p 1 - 1

KE Y1

KE Y2 ~ KEY 1 2

AU D

Figure 1 Reset of KEY1 playing sequence

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