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Table 1.6

Timers (2 of 2)

Feature

Functional description

Realtime Clock (RTC)

The RTC has two operation modes, normal operation mode and low-consumption clock mode. In

each of the operation mode, the RTC has two counting modes, calendar count mode and binary

count mode, that are used by switching register settings. For calendar count mode, the RTC

has a 100-year calendar from 2000 to 2099 and automatically adjusts dates for leap years. For

binary count mode, the RTC counts seconds and retains the information as a serial value. Binary

count mode can be used for calendars other than the Gregorian (Western) calendar.

Table 1.7

Communication interfaces

Feature

Functional description

Serial Communications Interface (SCI)

The Serial Communications Interface (SCI) × 5 channels have asynchronous and synchronous

serial interfaces:

● Asynchronous interfaces (UART and Asynchronous Communications Interface Adapter

(ACIA))

● 8-bit clock synchronous interface

● Simple IIC (master-only)

● Simple SPI

● Smart card interface

The smart card interface complies with the ISO/IEC 7816-3 standard for electronic signals and

transmission protocol. SCIn (n = 0) has FIFO buffers to enable continuous and full-duplex

communication, and the data transfer speed can be configured independently using an on-chip

baud rate generator.

I2C bus interface (IIC)

The I2C bus interface (IIC) has 2 channels. The IIC module conforms with and provides a subset

of the NXP I2C (Inter-Integrated Circuit) bus interface functions.

Serial Peripheral Interface (SPI)

The Serial Peripheral Interface (SPI) has 2 channels. The SPI provides high-speed full-duplex

synchronous serial communications with multiple processors and peripheral devices.

Control Area Network (CAN)

The Controller Area Network (CAN) module uses a message-based protocol to receive and

transmit data between multiple slaves and masters in electromagnetically noisy applications. The

module complies with the ISO 11898-1 (CAN 2.0A/CAN 2.0B) standard and supports up to 32

mailboxes, which can be configured for transmission or reception in normal mailbox and FIFO

modes. Both standard (11-bit) and extended (29-bit) messaging formats are supported. The CAN

module requires an additional external CAN transceiver.

Table 1.8

Analog

Feature

Functional description

12-bit A/D Converter (ADC12)

A 12-bit successive approximation A/D converter is provided. Up to 19 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.

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.

RA2L1 Datasheet

1. Overview

R01DS0385EJ0160 Rev.1.60

Oct 14, 2025

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