msm9811 Oki Semiconductor, msm9811 Datasheet - Page 22

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

Power Down Function
To enter the power down mode, set the RESET pin to “L”.
When an external clock is supplied to the XT pin, fix the XT pin at “L”.
If an external clock is supplied via the XT pin during the power down mode, the I
because current flows between the XT pin and the XT pin.
The circuit of XT and XT pins is shown below.
Channel Status
The channel status includes NCRn and BUSYn. These two channel statuses can be switched by setting the
NCR/BUSY pin.
The n-channel NCR signal is NCRn and the n-channel BUSY signal is BUSYn.
When NCRn is “H”, the START command and MUON command can be input for the next message of “n” channel
to be played.
When the phrase control table is used and BUSYn is “L”, do not enter the START command and MUON command
even if NCRn is “H”.
Otherwise, the LSI may malfunction.
When BUSYn is “H”, the “n” channel does not output a voice.
When BUSYn is “L”, the “n” channel outputs a voice.
OKI Semiconductor
Power down mode
Corresponding
channel
CH1
CH2
CH3
CH4
RESET
“L”
NCR/BUSY = “H”
NCR1
NCR2
NCR3
NCR4
XT
“L”
Approx. 500 k Ω
NCR/BUSY = “L”
BUSY1
BUSY2
BUSY3
BUSY4
XT
DS
Internal master clock
specification is not satisfied
FEDL9811FULL-04
MSM9811
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