RA4L1 datasheet(5/125 Pages) RENESAS

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Table 1.8

Communication interfaces (2 of 2)

Feature

Functional description

Quad Serial Peripheral Interface (QSPI) The Quad Serial Peripheral Interface (QSPI) is a memory controller for connecting a serial ROM

(nonvolatile memory such as a serial flash memory, serial EEPROM, or serial FeRAM) that has

an SPI-compatible interface.

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 40 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.

Table 1.9

Analog

Feature

Functional description

12-bit A/D Converter (ADC12)

A 12-bit successive approximation A/D converter (ADC12) is provided. Analog input channels

are selectable up to 16. The temperature sensor output and an 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.

Low-Power Analog Comparator

(ACMPLP)

The Low-Power Analog Comparator (ACMPLP) compares a reference input voltage with an

analog input voltage. Comparator channels ACMPLP0 and ACMPLP1 are independent of each

other.

The comparison result of the reference input voltage and analog input voltage can be read by

software. The comparison result can also be output externally. The reference input voltage can

be selected from either an input to the CMPREFi (i = 0, 1) pin or from the internal reference

voltage (VREF) generated internally in the MCU.

The ACMPLP response speed can be set before starting an operation. Setting high-speed mode

decreases the response delay time, but increases current consumption. Setting low-speed mode

increases the response delay time, but decreases current consumption.

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.

Segment LCD Controller (SLCDC)

The SLCDC provides the following functions:

● Internal voltage boosting method, capacitor split method, and external resistance division

method are switchable

● VL1 or VL2 reference mode is selectable under internal voltage boosting method

● VCC or VL4 reference mode is selectable under capacitor split method

● Segment signal output: 52 (48)

● Common signal output: 4 (8)

● Waveform A or B selectable

● The LCD can be made to blink

Note:

The values in parentheses are the number of signal outputs when 8 com is

used.

Table 1.11

Data processing

Feature

Functional description

Cyclic Redundancy Check (CRC)

calculator

The Cyclic Redundancy Check (CRC) 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 32-bit data. When a selected

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

RA4L1 Datasheet

1. Overview

R01DS0447EJ0131 Rev.1.31

May 26, 2026

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