Renesas R5F21227JFP#U1

Overview

R5F21227JFP from Renesas Electronics is an 8-bit R8C/22 Group microcontroller built on silicon gate CMOS technology, featuring the R8C CPU core, 48 KB flash program memory, 2.5 KB RAM, and a 48-pin LQFP package. It integrates a CAN 2.0B module (16-slot), 10-bit 12-channel ADC, UART0/UART1, LIN hardware interface, I²C bus, and multiple timers - designed for automotive and factory automation networking applications requiring real-time control and robust communication.

For engineers reviewing the R5F21227JFP datasheet, R5F21227JFP pinout, R5F21227JFP application, or R5F21227JFP equivalent, this MCU delivers deterministic timing with 50 ns minimum instruction execution (20 MHz XIN), operates across -40°C to +85°C, supports in-system programming via on-chip debug, and targets embedded control systems where CAN+LIN coexistence and analog sensing are critical.

Technical Context

The R5F21227JFP implements the R8C CPU core with 89 fundamental instructions and a 1 Mbyte unified address space. Its peripheral set includes two independent UARTs (UART0 with LIN support, UART1), a dedicated CAN 2.0B controller with 16 message buffers, and a 10-bit A/D converter with 12 analog inputs and internal reference voltage input (VREF).

It features dual clock generation circuits: an external XIN/XOUT crystal/resonator interface and a high-speed on-chip oscillator with frequency adjustment, plus oscillation stop detection. Memory architecture separates program ROM (48 KB) from internal RAM (2.5 KB), with no data flash - distinguishing it from the R8C/23 Group.

Key Specifications

Pinout & Package

Package: 48-pin plastic LQFP (PLQP0048KB-A), 7 mm × 7 mm body, 0.5 mm pin pitch, exposed pad not specified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit automotive microcontroller applications.

Compared with R5F21227JFP, R5F21227KFP extends temperature capability without altering code or hardware design, while R5F21237JFP adds data flash for persistent storage - both retain full peripheral compatibility and instruction-set equivalence.

Availability

R5F21227JFP is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN sensor nodes, and factory automation I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for R5F21227JFP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices for automotive and industrial markets.

The R8C/22 Group, including R5F21227JFP, was engineered for cost-sensitive, real-time embedded control in automotive and factory automation - emphasizing CAN/LIN coexistence, analog integration, and robust operation across extended temperature ranges.

FAQ

What is the maximum operating frequency of the R5F21227JFP?

The R5F21227JFP supports a maximum external crystal frequency of 20 MHz on the XIN pin, enabling a minimum instruction execution time of 50 ns. Its high-speed on-chip oscillator can also be adjusted to operate up to 20 MHz, providing clock source flexibility without external components. The device maintains full specification compliance across its 3.0 V to 5.5 V supply range at this frequency.

Does the R5F21227JFP include data flash memory?

No, the R5F21227JFP belongs to the R8C/22 Group and contains 48 KB of program flash memory only - it does not include embedded data flash. Data flash (1 KB ×2 blocks) is exclusive to the R8C/23 Group, such as the R5F21237JFP. For nonvolatile data storage, external EEPROM or FRAM must be used with the R5F21227JFP.

Which communication interfaces are supported by the R5F21227JFP?

The R5F21227JFP integrates UART0 (with LIN hardware support), UART1, I²C bus interface (SCL/SDA), clock-synchronous serial I/O with chip select (SSI/SCS/SSCK/SSO), and a full CAN 2.0B controller with 16 message buffers. It does not support SPI in master mode natively - SSI operates in synchronous serial mode but requires software bit-banging for SPI protocol emulation.

What is the purpose of the VREF pin on the R5F21227JFP?

The VREF pin (Pin 40) serves as the external reference voltage input for the 10-bit A/D converter. When connected to a stable voltage source (e.g., precision 2.5 V or 3.3 V), it defines the full-scale range of the ADC, improving measurement accuracy and rejecting supply rail noise. If left unconnected, the ADC defaults to VCC as reference, reducing precision in noisy power environments.

How many I/O pins does the R5F21227JFP provide, and what are their capabilities?

The R5F21227JFP provides 41 general-purpose I/O pins and 3 dedicated input-only pins (P4_2, P4_6, P4_7). Each I/O port supports individual direction control, programmable pull-up resistors, and alternate functions for peripherals like timers, UART, CAN, and ADC. All I/Os are CMOS-compatible with 5 V-tolerant inputs when VCC ≥ 3.0 V, enabling direct interfacing with legacy 5 V logic.