Integrated Circuits Inc.

aP8821

3

Group of sections

The voice memory of the

aP8821 can be subdivided into 126 memory blocks. Any combination of

playback of these memory blocks will form an individual voice group. A maximum of 14 groups are

available with triggering S1 to S4 pins together with the SBT pin sequential playback pin.

Group Configuration

Data within each group are combinations of different fixed memory blocks of up to 126 blocks. They

are the fundamental building blocks for arranging playback without limiting sequencing. This

provides flexibility and allows data to be re-used, beneficial for applications with many repeated

sounds or words.

An example of group configuration is illustrated below:

Group no.

Section entry

Group 1

Block 1 + Block 2 + Block 3 ……. Block 109

Group 2

Block 3 + Block 2

Group 3

Block 10 + Block 11 + Block 12

Group 4

Block 10 + Block 10 + Block 5

The entries of blocks for each group is truly random and without limitation. However, there is a limit

in the total number of entries for 14 voice groups, which is 960 entries in

aP8821. It is acceptable to

allocate all entries into only one group or distribute out to other groups. It depends on how many

groups of messages are required.

Programmable Options

Each groups in

aP8821 can have independent options. They include:

Edge or Level trigger

Unholdable or Holdable trigger

Re-triggerable or non-retriggerable

Outputs are programmable to LED1, LED2, BUSY and STOP pulse

Options that affect all voice groups are called whole chip options. They include:

Key trigger mode or CPU trigger mode

Ramp enable or Ramp disable