RA4E1 datasheet(10/81 Pages) RENESAS

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Table 1.14

Pin functions (2 of 3)

Function

Signal

I/O

Description

SCI

SCKn

I/O

Input/output pins for the clock (clock synchronous mode)

RXDn

Input

Input pins for received data (asynchronous mode/clock synchronous

mode)

TXDn

Output

Output pins for transmitted data (asynchronous mode/clock

synchronous mode)

CTSn_RTSn

I/O

Input/output pins for controlling the start of transmission and

reception (asynchronous mode/clock synchronous mode), active-

low.

CTSn

Input

Input for the start of transmission.

SCLn

I/O

Input/output pins for the IIC clock (simple IIC mode)

SDAn

I/O

Input/output pins for the IIC data (simple IIC mode)

SCKn

I/O

Input/output pins for the clock (simple SPI mode)

MISOn

I/O

Input/output pins for slave transmission of data (simple SPI mode)

MOSIn

I/O

Input/output pins for master transmission of data (simple SPI mode)

SSn

Input

Chip-select input pins (simple SPI mode), active-low

IIC

SCLn

I/O

Input/output pins for the clock

SDAn

I/O

Input/output pins for data

SPI

RSPCKA

I/O

Clock input/output pin

MOSIA

I/O

Input or output pins for data output from the master

MISOA

I/O

Input or output pins for data output from the slave

SSLA0

I/O

Input or output pin for slave selection

SSLA1 to SSLA3

Output

Output pins for slave selection

CAN

CRXn

Input

Receive data

CTXn

Output

Transmit data

USBFS

VCC_USB

Input

Power supply pin

VSS_USB

Input

Ground pin

USB_DP

I/O

D+ pin of the USB on-chip transceiver. Connect this pin to the D+

pin of the USB bus.

USB_DM

I/O

D- pin of the USB on-chip transceiver. Connect this pin to the D- pin

of the USB bus.

USB_VBUS

Input

USB cable connection monitor pin. Connect this pin to VBUS of the

USB bus. The VBUS pin status (connected or disconnected) can be

detected when the USB module is operating as a function controller.

USB_VBUSEN

Output

VBUS (5 V) supply enable signal for external power supply chip

USB_OVRCURA-DS

Input

Overcurrent pins for USBFS that can also be used in Deep Software

Standby mode.

Connect the external overcurrent detection signals to these pins.

QSPI

QSPCLK

Output

QSPI clock output pin

QSSL

Output

QSPI slave output pin

QIO0 to QIO3

I/O

Data0 to Data3

RA4E1 Datasheet

1. Overview

R01DS0391EJ0130 Rev.1.30

Jun 6, 2025

Page 10 of 81

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