UPD9971 datasheet(16/112 Pages) RENESAS

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µPD9971

Data Sheet S17455EJ2V0DS

(2/2)

Pin Name

Pin No.

I/O

Functions

1. Parallel I/F mode (when PS = 0)

Bit 0 for 8-bit host data bus

When the host CPU accesses

µPD9971, address and data I/O is performed.

When the CS_B signal in inactive (high), this pin is set to high impedance.

D0/(SERINT)

I/O

2. Serial I/F mode (when PS = 1)

Initialization signal for serial I/F

1. Parallel I/F mode (when PS = 0)

Bits 7 -1 for 8-bit host data bus

When the host CPU accesses

µPD9971, address and data I/O is performed.

When the CS_B signal in inactive (high), this pin is set to high impedance.

D1 to D7

8J, 10H,

9H, 10G,

9G, 10F, 9F

I/O

2. Serial I/F mode (when PS = 1)

This bus is always set to high impedance

INT_B

10E

Output

Interrupt request from PCM sound generator

This signal requests interrupts from the

µPD9971 to the host CPU.

This is used when requesting data transfer or internal status notification.

Input

Parallel/serial I/F mode setting

This pin sets the parallel or serial mode of the host CPU interface.

1: Serial I/F mode

0: Parallel I/F mode

This pin has an internal pull-down resistor

(4) Audio serial interface pins (ASIO)

Pin Name

Pin No.

I/O

Functions

BCLK

I/O

Bit synchronization clock I/O for audio serial

When this pin is not used, connect it to GND.

LRCLK

I/O

Audio serial frame synchronization clock I/O

When this pin is not used, connect it to GND.

ASO

Output

Audio serial data output

The audio serial data frame size is set via registers. During master mode, either

64 bits or 32 bits can be selected. During slave mode, selections can be made

in 2-bit steps within a range from 32 to 64 bits. Leave this pin open when not

used.

ASI

Input

Audio serial data input

The audio serial data frame size is set via registers. During master mode, either

64 bits or 32 bits can be selected. During slave mode, selections can be made

in 2-bit steps within a range from 32 to 64 bits. Leave this pin open when not

used. Pull-down is performed internally.

UPD9971 Datasheet(PDF) 16 Page - Renesas Technology Corp

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