ml2240 Oki Semiconductor, ml2240 Datasheet - Page 11

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

FUNCTIONAL DESCRIPTION
Micro-computer Interface
The micro-computer interface in the ML2240 has 2 types of interface circuits built in: Parallel interface and serial
interface. The interface setting can be changed with the SERIAL pin.
Table below shows the SERIAL pin status in the serial and parallel interfaces.
1. Parallel Interface
Command and Data Input Timing
OKI Semiconductor
When selecting the parallel interface, the I/O pins CS, WR, D7 to D0, and RD are used as input pins to input
various commands and data, and as output pins to read out the status of the commands and data input.
The micro-computer interface becomes effective when the CS pin is set to “L” level.
When a command or data is input, the input data to D7 through D0 pins is captured inside the device on the
rising edge of the WR pin.
To read the channels status, pins CS and RD are made “L” level. By doing so, the status signals of each channel
are output to D7 through D0 pins.
D7 (I/O)
D6 (I/O)
D5 (I/O)
D4 (I/O)
D3 (I/O)
D2 (I/O)
D1 (I/O)
D0 (I/O)
SERIAL pin = "H" level: Serial interface
SERIAL pin = "L" level: Parallel interface
D7 to D0 (I/O)
Data input and output pins/
status output pin
Parallel interface
SERIAL = “L”
WR (I)
CS (I)
Data Stable
STASEL (I)
STA3 (O)
STA2 (O)
STA1 (O)
STA0 (O)
SCK (I)
DO (O)
DI (I)
Serial data input pin
Serial clock input pin
Channel status serial output pin
Channel status switching pin
NCRn output at “L” level
BUSYn output at “H” level
Channel 4 status output pin
Channel 3 status output pin
Channel 2 status output pin
Channel 1 status output pin
Serial interface
SERIAL = “H”
FEDL2240DIGEST-02
ML2240 Family
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