ml2240 Oki Semiconductor, ml2240 Datasheet - Page 16

• Manufacturer Part Number: ml2240
• Description: 4-channel Mixing Oki Adpcm Algorithm-based Speech Synthesis Lsi
• Manufacturer: Oki Semiconductor

Power Down Function
In power down state, the power down function in the device stops the internal operation and oscillation, sets
AOUT to GND, and minimizes the static Idd.
Figure below shows the equivalent circuit of XT and XT pins.
Channel Status
Channel status is of 2 types: NCRn and BUSYn.
NCRn = “H” indicates that it is possible to input the PLAY, START, and MUON commands for the phrase to be
played back next for channel n.
BUSYn = “H” indicates a state in which channel n has not performed voice processing. BUSYn = “L” indicates a
state in which channel n is performing voice processing.
Meanwhile, after a command is input, the NCR and BUSY signals of all channels are at “L” level during the
processing of the command.
For Status output methods, see the Micro-computer Interface section.
OKI Semiconductor
RESET
External input
Channel
XT
“L”
CH1
CH2
CH3
CH4
1 MΩ approx.
“L”
XT
NCR1
NCR2
NCR3
NCR4
Channel status
To master clock inside the device
BUSY1
BUSY2
BUSY3
BUSY4
FEDL2240DIGEST-02
ML2240 Family
16/24