AP8842 Datasheet, PDF (3/14 Pages) Aplus Intergrated Circuits – 42 sec VOICE OTP

Integrated Circuits Inc. aP8842
„ Group of sections
The voice memory of the aP8842 is subdivided into 254 memory blocks. Any combination of
playback of these memory blocks will form an individual voice group. A maximum of 30 groups are
available with triggering S1 to S5 pins together with the SBT pin in CPU trigger mode. In Key
trigger mode, S1 to S8 pins are used to trigger the beginning 8 voice groups. The rest of the voice
groups can be triggered one by one sequentially with the SBT pin.
„ Group Configuration
Data within each group are combinations of different fixed memory blocks of up to 254 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 30 voice groups, which is 896 entries in aP8842. 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 aP8842 can have independent options. They are:
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 are:
z Key trigger mode or CPU trigger mode
z Ramp enable (for Cout drive) or Ramp disable (for Vout drive)
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