MSM9810 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9810

8-channel Mixing OKI ADPCM Type Voice Synthesis LSI

Oki Electric Industry 

¡ Semiconductor

MSM9810

6. Voice Output

The voice is output as 14-bit D/A converter output in stereo (LDAO, RDAO), with L/R in phase.

The output amplitude from the D/A converter has a maximum (16383/16384) ¥ VDD, and the

output waveform has a step waveform synchronized with sampling frequency.

The command option has been set for voice output. D/A converter output and voltage follower

output can be selected by option.

7. Microcomputer Interface

There are two types of interface with microcomputer; one is parallel input interface and the other

is serial input interface. Either of the two interfaces can be selected with the SERIAL pin. The

parallel input interface is selected when SERIAL is at a "L" level.

The serial input interface is selected when SERIAL is at "H" level.

When the parallel input interface is selected, the MSM9810 is controlled by nine different

commands using D7 to D0 (data buses) and control pins CMD, CS, WR, and RD. The internal

status register is used to check the status of the LSI.

When the serial input interface is selected, the MSM9810 is controlled by nine different

commands using serial data input pin SD and serial clock input pin SI, and control pins CMD,

CS, WR, and RD.

The SO, SR3, SR2, SR1 and SR0 pins are used to check the status of the LSI.

The pins 21 to 28 function differently according to whether the parallel input interface is selected

or the serial input interface is selected.

The table 7-1 shows the pin names. See "PIN DESCRIPTIONS" for their functions.

Table 7-1 Difference between parallel input and serial input pins

Pin number

Parallel input

Serial input

21 22 23 24 25 26 27 28

D7 D6 D5 D4 D3 D2 D1 D0

SD SI SO UD SR3 SR2 SR1 SR0

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