CXD2721Q-1 データシートの表示（PDF） - Sony Semiconductor

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CXD2721Q-1

Single-Chip Digital Signal Processor for Karaoke

Sony Semiconductor 

CXD2721Q-1

5. Microcomputer Interface

[Relevant pins] RVDT, TRDT, SCK, XLAT, REDY

The CXD2721Q-1 performs the serial audio interface format setting and coefficient settings such as volume

and microphone echo delay amount by serial data from the microcomputer.

Further, bidirectional communication such as internal data read from the CXD2721Q-1 to the microcomputer

can be performed at the rate of once per 1 LRCK.

(1) Pin Configuration

The five external pins indicated in the table below are assigned to the microcomputer interface.

The microcomputer interface begins operation when XLAT is received, so multiple CXD2721Q-1 can be used

by connecting RVDT, TRDT, SCK and REDY in common and controlling (wiring) only XLAT separately.

Symbol I/O

RVDT I

TRDT O

SCK I

XLAT I

REDY O

Function

Serial data input from microcomputer.

Serial data output to the microcomputer. High impedance status unless this pin is set to

internal data read status by the microcomputer. Therefore, pull-up or pull-down should be

performed so that the potential is not unstable when this pin is not active.

Shift clock for serial data. Input data from RVDT is taken according to the SCK rise, and

output data from TRDT is sent out according to the SCK fall.

Interprets the 8 bits of RVDT before this signal rises as transfer mode data, and the bits

before that as address data.

Transfer prohibited when Low level. Transfer enabled when High. This pin is an open drain,

and must be pulled up externally.

Table 5-1. Microcomputer Interface External Pins

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