Instruction Manual

Integrated Circuits Inc. aP8921A/10A

Ver 2.0 Dec 6, 2006

Programmable Options

In both Key Trigger Mode and CPU Parallel Trigger Mode, user can select different trigger

functions and output signals to be sent out from the pins OUT1 and OUT2.

Options affect all Voice Group playback are called Whole Chip Options. Options only affect the

playback of individual Voice Group are called Group Options.

Whole Chip Options

• Key or CPU Parallel Trigger Mode.

• Ramp-up-down enable or disable:

When COUT is used for playback, Ramp-up-down should be enabled. This function

eliminates the ‘POP’ noise at the beginning and end of voice playback.

When VOUT1 and VOUT2 are used to drive speaker directly, Ramp-up-down should be

disabled.

Fig. 1 Ramp-up-down Enable Fig.2 Ramp-up-down Disable

• Output Options:

This option sets up the three output pins OUT1 and OUT2 to send out different signals

during voice playback. Four settings are allowed:

aP8910A aP8921A

OUT1 OUT2 OUT1 OUT2

Option 1 LED2 LED1 LED2 LED1

Option 2 STOP LED1 LED2 STOP

Option 3 LED2 BUSY LED2 BUSY

Option 4 - - STOP BUSY

Note: Stop plus must be set to enable in order to have STOP plus to come out.

Fig. 3 Output waveforms