Renesas R5F2122CKFP#U0

Overview

R5F2122CKFP#U0 from Renesas Electronics is a 16-bit R8C/22 Group microcontroller built on silicon gate CMOS technology, featuring an R8C CPU core, 128 KB flash program memory, 6 KB RAM, and integrated CAN 2.0B interface - designed for automotive and factory automation networking applications requiring robust real-time control and embedded communication.

For engineers reviewing the R5F2122CKFP#U0 datasheet, R5F2122CKFP#U0 pinout, R5F2122CKFP#U0 application, or R5F2122CKFP#U0 equivalent, this MCU delivers deterministic interrupt response (7 priority levels), 12-channel 10-bit ADC, dual UARTs with LIN support, and 48-pin LQFP packaging compatible with industrial temperature operation (−40°C to +85°C).

Technical Context

The R5F2122CKFP#U0 implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN clock, VCC = 3.0–5.5 V). It operates in single-chip mode with a unified 1 Mbyte address space and includes two independent clock generation circuits: XIN-based crystal/resonator oscillator and adjustable high-speed/low-speed on-chip oscillators.

Peripheral integration includes Timer RA/RB (8-bit × 2), Timer RD (16-bit × 2 with input capture/output compare), Timer RE (8-bit with compare match), hardware LIN module (using Timer RA and UART0), and a dedicated CAN 2.0B controller with 16 message slots - all mapped to 41 I/O pins and 3 dedicated input-only pins in the 48-pin LQFP package.

Key Specifications

Pinout & Package

Package: 48-pin plastic LQFP (PLQP0048KB-A), 0.5 mm pitch, 7 mm × 7 mm body - surface-mount compatible with standard reflow profiles and IPC-7351B land patterns.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with R5F2122CKFP#U0, R5F2123CKFP#U0 adds data flash for field-updatable parameters but shares identical CAN timing, ADC performance, and interrupt latency; R5F2122AKFP#U0 reduces memory capacity while preserving all real-time control capabilities - enabling cost-tiered product variants without redesigning PCB or firmware architecture.

Availability

R5F2122CKFP#U0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC subsystems, and motor control applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for R5F2122CKFP#U0 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 specializing in microcontrollers, analog, and power solutions for automotive, industrial, and IoT markets - formed in 2010 through the merger of NEC Electronics and Renesas Technology.

The R8C/22 Group, including R5F2122CKFP#U0, was engineered for cost-sensitive embedded control in harsh environments - emphasizing CAN/LIN connectivity, mixed-signal integration, and robust operation across extended temperature ranges.

FAQ

What is the maximum operating frequency of the R5F2122CKFP#U0?

The R5F2122CKFP#U0 supports a maximum external clock frequency of 20 MHz (XIN input), achieving a minimum instruction execution time of 50 ns under VCC = 3.0–5.5 V conditions. Its high-speed on-chip oscillator is adjustable up to 20 MHz but has ±2% accuracy; for precise timing, use external crystal with XIN/XOUT pins. The R5F2122CKFP#U0 does not support frequencies beyond 20 MHz in any configuration.

Does the R5F2122CKFP#U0 include data flash memory?

No, the R5F2122CKFP#U0 belongs to the R8C/22 Group and contains only program flash memory (128 KB) and RAM (6 KB). It lacks the dedicated data flash blocks found in the R8C/23 Group (e.g., R5F2123CKFP#U0). If non-volatile parameter storage is required, external EEPROM or FRAM must be added, or the R5F2123CKFP#U0 variant selected. The R5F2122CKFP#U0 specification explicitly omits data flash in all documentation.

Which pins on the R5F2122CKFP#U0 support analog-to-digital conversion?

The R5F2122CKFP#U0 provides 12 analog input channels mapped to pins AN0–AN11: P0_0–P0_7 (Pins 47–36), P1_0–P1_3 (Pins 30–24), and P4_2 (Pin 40, VREF). All 12 pins share the same 10-bit successive-approximation ADC with internal reference options. Pin P4_2 serves exclusively as VREF input and cannot function as an analog input channel itself. Each channel is software-selectable via the AD control registers.

Can the R5F2122CKFP#U0 operate across the full industrial temperature range?

Yes, the R5F2122CKFP#U0 is rated for −40°C to +85°C ambient operation (J version), meeting industrial and automotive under-hood requirements. It does not support the extended −40°C to +125°C range (K version) - that capability is exclusive to part numbers ending in "KFP" (e.g., R5F2122CKFP is J-version; R5F2122CKFP#U0 follows the J-version specification per Renesas documentation). Thermal derating guidelines apply above 70°C for sustained 20 MHz operation.

What debug interfaces are supported by the R5F2122CKFP#U0?

The R5F2122CKFP#U0 supports Renesas E8 and E10 emulator debug interfaces via dedicated on-chip circuitry. Debug access uses the reserved memory region 20000h–23FFFh and requires the Renesas HEW or e2 studio IDE. No SWD, JTAG, or UART-based bootloader is integrated - debugging relies entirely on the proprietary Renesas emulator connection. The R5F2122CKFP#U0 does not implement a user-accessible ROM bootloader or serial programming mode.