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Table 1.8

Communication interfaces (2 of 2)

Feature

Functional description

Layer 3 Ethernet Switch Module

(ESWM)

The Layer 3 Ethernet Switch Module (ESWM) consists of two channels of Gigabit Ethernet

controller, an Ethernet switch with high level routing capability, and multi-protocol interface

support. The Gigabit Ethernet controller conforms to the definition of the Ethernet MAC (Media

Access Control) layer in the IEEE 802.3 standard. This can transmit and receive Ethernet

(IEEE 802.3) frames by connecting with an external physical-layer LSI chip (PHY-LSI) which

complies with the standard. The Ethernet switch allows autonomous frame routing within a

same network interface protocol, or between different network interfaces protocols or optimized

gateway applications.

Pulse Density Modulation Interface

(PDMIF)

PDM-IF has maximum three channels that are connectable with external microphone which

outputs the pulse density modulated (PDM) signal. PDM-IF is connectable with up to three

external microphones. PDM-IF can filter and convert 1-bit digital data streams that were pulse

density modulated at a high sampling rate into 20-bit or 16-bit digital data at a lower sampling

rate.

Table 1.9

Analog

Feature

Functional description

16-bit A/D Converter (ADC16H)

A 16-bit A/D Converter is provided. Up to 23 analog input channels are selectable. Temperature

sensor output, and internal reference voltage and VBATT 1/6 voltage monitor 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 ADC16H for conversion and can be further used by

the end application. The sensor outputs an abnormal temperature detection signal to the reset

control circuit and can be used to prevent the malfunction due to abnormal temperature.

High-Speed Analog Comparator

(ACMPHS)

The High-Speed Analog Comparator (ACMPHS) can be used to compare an analog input

voltage with a reference voltage and to provide a digital output based on the result of conversion.

Both the analog input voltage and the reference voltage can be provided to the ACMPHS from

internal sources (D/A converter output or internal reference voltage) and an external source.

Such flexibility is useful in applications that require go/no-go comparisons to be performed

between analog signals without necessarily requiring A/D conversion.

Table 1.10

Human machine interfaces

Feature

Functional description

Capture Engine Unit (CEU)

The Capture Engine Unit (CEU) is a capture module that fetches image data externally input and

transfers it to the memory.

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. The snoop

function allows monitoring reads from and writes to specific addresses. This function is useful

in applications that require CRC code to be generated automatically in certain events, such as

monitoring writes to the serial transmit buffer and reads from the serial receive buffer.

Data Operation Circuit (DOC)

The Data Operation Circuit (DOC) compares, adds, and subtracts 32-bits data. When a selected

condition applies, 32-bit data is compared and an interrupt can be generated.

RA8M2 Datasheet

1. Overview

R01DS0438EJ0130 Rev.1.30

Feb 27, 2026

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