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Table 1.8

Communication interfaces (2 of 2)

Feature

Functional description

Serial Sound Interface Enhanced (SSIE) The Serial Sound Interface Enhanced (SSIE) peripheral provides functionality to interface with

digital audio devices for transmitting I2S/Monaural/TDM audio data over a serial bus. The SSIE

supports an audio clock frequency of up to 50 MHz, and can be operated as a slave or master

receiver, transmitter, or transceiver to suit various applications. The SSIE includes 32-stage

FIFO buffers in the receiver and transmitter, and supports interrupts and DMA-driven data

reception and transmission.

SD/MMC Host Interface (SDHI)

The SDHI and MultiMediaCard (MMC) interface module provides the functionality required to

connect a variety of external memory cards to the MCU. The SDHI supports both 1- and 4-bit

buses for connecting memory cards that support SD, SDHC, and SDXC formats. When

developing host devices that are compliant with the SD Specifications, you must comply with the

SD Host/Ancillary Product License Agreement (SD HALA). The MMC interface supports 1-bit, 4-

bit, and 8-bit MMC buses that provide eMMC 4.51 (JEDEC Standard JESD 84-B451) device

access. This interface also provides backward compatibility and supports high-speed SDR

transfer modes.

Table 1.9

Analog

Functional description

12-bit A/D Converter (ADC12)

A 12-bit successive approximation A/D converter is provided. Up to 22 analog input channels are

selectable. Temperature sensor output and internal reference voltage are selectable for

conversion.

12-bit D/A Converter (DAC12)

A 12-bit D/A converter (DAC12) is provided.

Temperature Sensor (TSN)

The on-chip Temperature Sensor (TSN) determines and monitors the die temperature for reliable

operation of the device. The sensor outputs a voltage directly proportional to the die

temperature, and the relationship between the die temperature and the output voltage is fairly

linear. The output voltage is provided to the ADC12 for conversion and can be further used by

the end application.

Table 1.10

Human machine interfaces

Feature

Functional description

Capacitive Touch Sensing Unit (CTSU)

The Capacitive Touch Sensing Unit (CTSU) measures the electrostatic capacitance of the touch

sensor. Changes in the electrostatic capacitance are determined by software that enables the

CTSU to detect whether a finger is in contact with the touch sensor. The electrode surface of the

touch sensor is usually enclosed with an electrical conductor so that a finger does not come into

direct contact with the electrode.

Table 1.11

Data processing

Feature

Functional description

Cyclic Redundancy Check (CRC)

calculator

The Cyclic Redundancy Check (CRC) calculator generates CRC codes to detect errors in the

data. The bit order of CRC calculation results can be switched for LSB-first or MSB-first

communication. Additionally, various CRC-generation polynomials are available.

Data Operation Circuit (DOC)

The Data Operation Circuit (DOC) compares, adds, and subtracts 16-bit data. When a selected

condition applies, 16-bit data is compared and an interrupt can be generated.

RA4M3 Datasheet

1. Overview

R01DS0368EJ0120 Rev.1.20

Dec 2, 2020

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