Rainbow Electronics aP8910A - Manual (Page 6)

Integrated Circuits Inc. aP8921A/10A
Ver 2.0 Dec 6, 2006 6
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