RA4L1 datasheet(4/125 Pages) RENESAS

4 / 125 page

Table 1.7

Timers (2 of 2)

Feature

Functional description

Realtime Clock (RTC)

The Realtime Clock (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.

Watchdog Timer (WDT)

The Watchdog Timer (WDT) is a 14-bit down counter that can be used to reset the MCU when

the counter underflows because the system has run out of control and is unable to refresh the

WDT. In addition, the WDT can be used to generate a non-maskable interrupt or an underflow

interrupt.

Independent Watchdog Timer (IWDT)

The Independent Watchdog Timer (IWDT) consists of a 14-bit down counter that must be

serviced periodically to prevent counter underflow. The IWDT provides functionality to reset

the MCU or to generate a non-maskable interrupt or an underflow interrupt. Because the timer

operates with an independent, dedicated clock source, it is particularly useful in returning the

MCU to a known state as a fail-safe mechanism when the system runs out of control. The IWDT

can be triggered automatically by a reset, underflow, refresh error, or a refresh of the count value

in the registers.

Table 1.8

Communication interfaces (1 of 2)

Feature

Functional description

Serial Communications Interface (SCI)

The Serial Communications Interface (SCI) × 6 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

● Manchester interface

● Simple LIN

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

transmission protocol. SCIn (n = 0, 3 to 5, 9) 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.

IrDA Interface

The IrDA interface sends and receives IrDA data communication waveforms in cooperation with

the SCI5 based on the IrDA (Infrared Data Association) standard 1.0.

I2C bus interface (IIC)

The I2C bus interface (IIC) has one channel. The IIC module conforms with and provides a

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

I3C bus interface (I3C)

The I3C bus interface (I3C) has one channel. The I3C module conforms with and provides a

subset of the NXP I2C (Inter-Integrated Circuit) bus interface functions and a subset of the MIPI

I3C.

Serial Interface UARTA (UARTA)

The serial interface UARTA (UARTA) has two channels. The UARTA supports the following

modes:

● Operation stop mode

● UART mode

Serial Peripheral Interface (SPI)

The Serial Peripheral Interface (SPI) has one channel. The SPI provides high-speed full-duplex

synchronous serial communications with multiple processors and peripheral devices.

Control Area Network with Flexible

Data-Rate Module (CAN-FD)

The CAN with Flexible Data-Rate (CANFD) module can handle classical CAN frames and

CANFD frames complied with ISO 11898-1 standard. The module supports 4 transmit buffers

and 16 receive buffers.

USB 2.0 Full-Speed module (USBFS)

The USB 2.0 Full-Speed module (USBFS) can operate as a host controller or device controller.

The module supports full-speed and low-speed (host controller only) transfer as defined in

Universal Serial Bus Specification 2.0. The module has an internal USB transceiver and supports

all of the transfer types defined in Universal Serial Bus Specification 2.0. The USB has buffer

memory for data transfer, providing a maximum of 10 pipes. Pipes 1 to 9 can be assigned any

endpoint number based on the peripheral devices used for communication or based on your

system.

RA4L1 Datasheet

1. Overview

R01DS0447EJ0131 Rev.1.31

May 26, 2026

Page 4 of 125

RA4L1 Datasheet(PDF) 4 Page - Renesas Technology Corp

RA4L1 Datasheet(HTML) 4 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL