UPD9971 datasheet(48/112 Pages) RENESAS

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µPD9971

Data Sheet S17455EJ2V0DS

5.9 Serial Interface Dedicated to Sound Generator Core External Connection (MSIO)

Figure 5-10 Serial Interface Dedicated to Sound generator Core External Connection

Melody serial

I/F

MEN

L-ch

MMS

Melody core

STMSI,

STMSO

MBCLK

MSO

MSI

STMSO

STMSI

MLOOPSW

Melody core

R-ch

L-ch

MMS

SMBCLK

SMEN

MBFS[2:0]

MCHO[3:0]

MCHI[3:0]

MBFS[2:0] MLOOPSW

MMS

SMBCLK

SMEN

MMS

Melody core

MCHO[3:0]

MCHI[3:0]

This block has the following functions:

• Converts serial data input from MSI into parallel data, and outputs the parallel data to the sound generator core

block.

• Converts parallel data input from the sound generator core block into serial data, and outputs the serial data

from MSO.

• Has a fixed sampling frequency of 32 kHz.

• Can change the frequency of MBCLK (default: 64 fs) by setting the register.

• Can set the number of valid data items in MSI input data and MSO output data individually by setting the

• Can perform data loop back between MSI and MSO by setting the register.

• Can select the slave (default) or master mode by setting the register.

• Can select the frame synchronous (default) or LR stereo mode by setting the register.

• Can invert the MBCLK bit clock by setting the register.

• Receives power supply from DVDD.

UPD9971 Datasheet(PDF) 48 Page - Renesas Technology Corp

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