AP8821 Datasheet, PDF (3/13 Pages) Aplus Intergrated Circuits – 21 sec VOICE OTP

Integrated Circuits Inc. aP8821
„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.
Group 1
Group 2
Group 3
Group 4
Section entry
Block 1 + Block 2 + Block 3 ……. Block 109
Block 3 + Block 2
Block 10 + Block 11 + Block 12
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:
x Edge or Level trigger
x Unholdable or Holdable trigger
x Re-triggerable or non-retriggerable
x Outputs are programmable to LED1, LED2, BUSY and STOP pulse
Options that affect all voice groups are called whole chip options. They include:
z Key trigger mode or CPU trigger mode
z Ramp enable or Ramp disable
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