FEDL2280X-04 Datasheet, PDF (33/41 Pages) List of Unclassifed Manufacturers – LAPIS Semiconductor ADPCM Algorithm-Based Speech Synthesis LSI

FEDL2280XFULL-04
ML22808/ML22804/Ml22802-XXX
7. MUON command
• command
0
1
1
1 ⎯⎯⎯ ⎯
M7 M6 M5 M4 M3 M2 M1 M0
1st byte
2nd byte
The MUON command is a 2-byte command. This command is used to insert silence between the two playback
phrases. The MUON command is enabled when the NCR signal is at a “H” level. Set the silence time length
using the second byte of this command.
As the silence length (M7 to M0), a value between 4 ms and 1024 ms can be set in 4 ms intervals (252 steps in
total).
The equation to set the silence time length is shown below.
The silence length (M7-M0) must be set to 04h or higher.
t_mu = (2⁷×(M7) + 2⁶×(M6) + 2⁵×(M5) + 2⁴×(M4) + 2³Ã—(M3) + 2²Ã—(M2) + 2¹Ã—(M1) + 2⁰×(M0) + 1) × 4ms
The timing diagram shown below is a case of inserting a silence of 20 ms between the repetitions of a phrase of
(F7–F0) = 01h.
CS
SCK
DI
PLAY command
2^nd byte
MUON command MUON command
1^st byte
2^nd byte
PLAY command PLAY command
1^st byte
2^nd byte
tcm
tcm
NCR
BUSY
1V
AOUT
Status Awaiting command
Address is being controlled
Playing
Waiting for playback to be finished
Silence is being inserted
Waiting for silence insertion
to be finished
Playing
When the PLAY command is input, the address control of phrase 1 ends, the phrase playback starts, and the
NCR signal goes “H” level. Input the MUON command after this NCR signal changes to the “H” level. After
the MUON command input, the NCR signal remains “L” up to the end of phrase 1 playback, and the device
enters a state waiting for the phrase 1 playback to end.
When the phrase 1 playback finishes, the silence playback starts, and NCR1 signal goes “H” level. After this
NCR signal has changed to the “H” level, re-input the PLAY command in order to play phrase 1.
After the PLAY command input, the NCR signal once again returns to “L” level and the device enters the state
waiting for the end of silence playback.
When the silence playback finishes and then the phrase 1 playback starts, the NCR signal goes “H”, and the
device enters a state in which it is possible to input the next PLAY or MUON command.
The BUSY signal remains “L” until the end of a series of playback.
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