ML22808 Datasheet, PDF (30/41 Pages) List of Unclassifed Manufacturers – LAPIS Semiconductor ADPCM Algorithm-Based Speech Synthesis LSI

FEDL2280XFULL-04
ML22808/ML22804/Ml22802-XXX
5. PLAY command
• command
0
1
0
0 ⎯⎯⎯ ⎯
F7 F6 F5 F4 F3 F2 F1 F0
1st byte
2nd byte
The PLAY command is a 2-byte command. Set the playback phrase using the second byte of this command.
The PLAY command can be input when the NCR signal is at a “H” level.
Since it is possible to specify the playback phrase (F7 to F0) at the time of creating the ROM that stores voice
data, set the phrase that was set when the ROM was created.
Figure below shows the timing of phrase (F7 to F0 = 01H) playback.
PLAY command
1^st byte
PLAY command
2^nd byte
CS
SCK
DI
NCR
BUSY
1V
AOUT
Status Awaiting command
Command is being processed
Awaiting command
Address is being
controlled
Playing
Awaiting command
When the 1^st byte of the PLAY command is input, the device enters a state in which it waits for the 2^nd byte to be
input after the elapse of the command processing time. When the 2^nd byte of PLAY command is input, after an
elapse of the command processing time, the device starts reading from the ROM the address information of the
phrase to be played. Thereafter, playback operation starts, the playback is performed up to the specified ROM
address, and then the playback ends automatically.
The NCR1 signal is at a “L” level during address control, and goes “H” when the address control is finished and
playback is started. When this NCR signal goes “H”, then it is possible to input the PLAY command for the
next playback phrase.
During address control, the BUSY signal is at a “L” level during playback and goes “H” when playback is
finished. Whether the playback is going on can be known by the BUSY signal.
Time Required for Address Control
The time required for controlling the address of the playback phrase after input of the PLAY command is the
time of 16 to 17 periods of the sampling frequency of the the phrase that was played last. After power is turned
on or after RESET is input, it is the time of 16 to 17 periods of 4 kHz sampling frequency.
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