R01UH0823EJ0100 Rev.1.00
Page 1302 of 1823
Jul 31, 2019
RX23W Group
37. Serial Sound Interface (SSI)
37.
Serial Sound Interface (SSI)
This MCU integrates one channel of the serial sound interface (SSI) compliant with the I
2
S bus specification. The SSI
supports I
2
S data format and MSB-first and left-justified/right-justified formats, so it can be used to send or receive audio
data with various devices.
37.1
Overview
Table 37.1
SSI Specifications
Item
Specifications
Number of channels
One channel (SSI0)
Operating mode
Non-compressed mode
Transmission formats
I
2
S format supported
MSB-first supported
Left-justified/right-justified formats selectable
Function
Serves as both a transmitter and a receiver
Channel 0 supports full-duplex communications.
Capable of various audio formats
SSISCK0 (serial bit clock) can be selected from among 16, 32, 48, and 64 fs (fs: Sampling rate)
The master clock (MCLK) can be selected from either of the following:
Master clock pin for audio (AUDIO_MCLK): 1 to 25 MHz
Main clock
Includes 8-stage FIFO buffers in transmitter and receiver
Capable of selecting whether to stop word select (SSIWS0) or not when data transmission is stopped
Interrupt sources
Three sources
Communication error
Transmit underflow, transmit overflow, receive underflow, receive overflow, and idle
Receive data full
Transmit data empty
Low power consumption
function
Module stop state can be set.