msm9811 Oki Semiconductor, msm9811 Datasheet - Page 32

• Manufacturer Part Number: msm9811
• Description: 4-channel Mixing Oki Adpcm Type Voice Synthesis Lsi
• Manufacturer: Oki Semiconductor

3)
When power is turned on, it has been set that the output of the D/A converter is output via the voltage follower. To
change this setting, use the OPT command.
The output impedance of analog signals being output via the voltage follower is about 500 Ω.
The output impedance of analog signals directly output from the D/A converter is about 3 kΩ.
MUON Command
The MUON command inserts silence into the specified channel at the rise of the WR pulse. The length of silence is
according to the size of data stored in the TMP register.
The length of silence data is input in advance, before executing the MUON command. Silence length can be set for
255 steps, 4 ms to 1020 ms, in 4 ms intervals. Silence time can be set as follows.
t
The operation of the MUON command is similar to the START command to start voice synthesis. When the
MUON command is input, “H” is set to the START register, and NCR and BUSY signals becomes “L”.
If the MUON command is input when voice synthesis is in execution, silence time is inserted after voice synthesis
ends.
Input the MUON command when the status signal (NCR or BUSY) of the channel to start voice synthesis is at “H”.
When NCR is “L”, input is disabled. When the phrase control table is used, input the MUON command while
BUSY is “H”. Otherwise, the LSI may malfunction.
Figure 6 shows a flow chart example when the MUON command is input.
OKI Semiconductor
mu
= (2
Analog Output
7
× (D7) + 2
MUON command input
Subcommand input
RD pulse input
NCRn = “H”
6
× (D6) + 2
Yes
5
× (D5) + 2
Figure 6 MUON Command Input Flow
No
4
× (D4) + 2
NCRn corresponding to each channel is output to D7-D0.
Check that D7-D0 corresponding to the channel to insert
silence is “H”.
( BUSY n is “H” when the phrase control table is used.)
After setting time of inserting silence from the data bus, input
WR pulse (set CMD to “H”).
Specify channel by MUON command.
3
× (D3) + 2
2
× (D2) + 2
1
× (D1) + 2
0
× (D0)) × 4.096 ms
FEDL9811FULL-04
MSM9811
32/44