Integrated Circuits Inc.

aP8921A/10A

Ver 5.0

Aug 23, 2011

10

TRIGGER MODES

Two trigger modes, the KEY and CPU modes, are available for aP8921A/10A series which are

determined by setting the EPORM programmable options during voice data compilation.

For both trigger modes, up to 12 Voice Groups are being played back according to the following

setting of trigger pins S1 to S4.

Voice Group

S1

S2

S3

S4

1

HIGH

NC

NC

NC

2

NC

HIGH

NC

NC

3

NC

NC

HIGH

NC

4

NC

NC

NC

HIGH

5

HIGH

HIGH

NC

NC

6

NC

HIGH

HIGH

NC

7

NC

NC

HIGH

HIGH

8

HIGH

NC

NC

HIGH

9

HIGH

HIGH

HIGH

NC

10

NC

HIGH

HIGH

HIGH

11

HIGH

NC

HIGH

HIGH

12

HIGH

HIGH

NC

HIGH

Note: Where NC (open or no connection) should be replaced by a logic input LOW in CPU

Parallel Trigger Mode.

Key Trigger Mode

With this trigger mode, up to 12 Voice Groups are triggered by setting S1 to S4 to HIHG or NC in

different combinations.

Each Voice Group can have its only independent trigger options (See Fig.

4, 5, 7 and 8 for trigger options definition).

Voice Groups can also be triggered sequentially by setting SBT pin to HIGH.