HT812L0 データシートの表示（PDF） - Holtek Semiconductor

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HT812L0

2.8 Second Enhanced Tone Voice

Holtek Semiconductor 

HT812L0

For example:

Group 1-1 sec.1 + sec.4

Group 1-2 sec.3 + Melody.1

:

:

:

:

Group 1-N sec.2 + sec1 + Melody.1 + sec.1

Group 2 Melody.1 + Melody.3 + sec.1

Group 3 sec.2 + sec.3

:

:

:

:

Group 16 sec.1 + Melody.2 + Melody.3

Each time KEY1 is triggered, the corre-

sponding group is played in sequence. When

the last group is finished the KEY1 group

sequence will be repeated by successive trig-

ger inputs.

♦ KEY1 as a two-group key (TWIN mode).

KEY1 can play two groups, if KEY1 is held

down, the group 1 can be played repeatedly

till KEY1 is released, and immediately then

the group 2 will be played one cycle by the

rising edge of KEY1. (see Figure 1)

Key operation functions

KEY1~KEY8 all function as trigger keys. By

mask option, the HT812L0 provides three trig-

ger functions for the 8 keys , namely: “one shot”,

“level hold” and “level trigger”. All of the three

trigger functions can be optioned as retrigger-

able or non-retriggerable.

• Trigger function

♦ One shot

When one of the 8 keys (KEY1~KEY8) is

pressed and held down, or pressed momen-

tarily, the group corresponding to that held

or pressed key will play once.

♦ Level hold

When one of the 8 keys is triggered, the

group corresponding to the triggered key

will keep playing till that key is released.

♦ Level trigger

When one of the 8 keys is pressed and held

down, the corresponding group will keep

playing. Once the pressed key is released,

the group will not stop till the included sec-

tions are all completed.

Figure 1 One key two groups function (TWIN mode)

5

5th May ’98

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