Renesas R5F21255SNFP#X6

Overview

R5F21255SNFP#X6 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/25 Group, featuring an R8C/Tiny Series CPU core, 24 KB flash program memory, 2 KB RAM, and 2 KB on-chip data flash. It operates at up to 20 MHz (50 ns min. instruction time), supports 12-channel 10-bit A/D conversion, dual UARTs, I²C, LIN, and real-time clock functionality, and targets embedded control in consumer appliances and office equipment.

For engineers reviewing the R5F21255SNFP#X6 datasheet, R5F21255SNFP#X6 pinout, R5F21255SNFP#X6 application, or R5F21255SNFP#X6 equivalent, key selection criteria include its 52-pin LQFP package (PLQP0052JA-A), -20°C to +85°C operating range (N version), integrated data flash for parameter storage, and hardware LIN support tied to Timer RA and UART0.

Technical Context

The R5F21255SNFP#X6 implements the R8C/Tiny CPU core with 89 fundamental instructions and a 1 Mbyte address space. Its memory subsystem includes 24 KB of flash program ROM and two independent 1 KB data flash blocks-enabling nonvolatile parameter storage without external EEPROM.

Peripheral integration includes Timer RD (16-bit × 2 channels with input capture/output compare), Timer RE (real-time clock with compare match), and dual UARTs supporting LIN physical layer compliance via hardware assist on UART0 and Timer RA. Clock sources comprise XIN (external crystal/resonator), high-speed/low-speed on-chip oscillators, and XCIN (32 kHz crystal for RTC).

Key Specifications

Pinout & Package

Package: 52-pin LQFP (PLQP0052JA-A), 10 mm × 10 mm body, 0.65 mm pin pitch, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R5F21255SNFP#X6, R5F21256SNFP offers headroom for feature-rich firmware while maintaining full hardware compatibility, whereas R5F21245SNFP removes data flash to reduce cost but shifts parameter storage responsibility to external components.

Availability

R5F21255SNFP#X6 is available at Aetrix Electronics and suitable for home appliance control, office equipment monitoring, and industrial panel meter applications requiring stable component supply and long-term production continuity.

Supply support for R5F21255SNFP#X6 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 solutions.

The R8C/25 Group, including R5F21255SNFP#X6, was designed for cost-sensitive, low-power embedded control in consumer and industrial equipment where integrated data flash and hardware LIN reduce system complexity and bill-of-materials cost.

FAQ

What is the maximum operating frequency of the R5F21255SNFP#X6?

The R5F21255SNFP#X6 supports a maximum external clock frequency of 20 MHz on the XIN pin, achieving a minimum instruction execution time of 50 ns at VCC = 3.0–5.5 V. Its high-speed on-chip oscillator is adjustable but rated lower than the external crystal path; for deterministic timing-critical applications like LIN communication, the external 20 MHz source is recommended. The R5F21255SNFP#X6 does not support frequencies above 20 MHz.

Does the R5F21255SNFP#X6 include on-chip data flash memory?

Yes, the R5F21255SNFP#X6 includes 2 KB of on-chip data flash memory organized as two 1 KB blocks, rated for 10,000 erase/write cycles. This memory is electrically separate from the 24 KB program flash and is intended for storing calibration data, device configuration, or user settings that must persist across power cycles. The R5F21255SNFP#X6 data flash operates at the same VCC range (2.7–5.5 V) as the main flash.

What package type and pin count does the R5F21255SNFP#X6 use?

The R5F21255SNFP#X6 uses a 52-pin LQFP package designated PLQP0052JA-A: 10 mm × 10 mm body size, 0.65 mm pin pitch, and RoHS-compliant lead-free finish. It is not offered in the 64-pin FLGA variant - that package is used for higher-pin-count members of the R8C/25 Group. The R5F21255SNFP#X6 pinout matches other SNFP-suffixed R8C/25 devices, enabling layout reuse across memory variants.

Can the R5F21255SNFP#X6 operate in low-power modes?

Yes, the R5F21255SNFP#X6 supports multiple low-power modes: wait mode draws typ. 2.0 µA (VCC = 3.0 V, f(XCIN) = 32 kHz), and stop mode draws typ. 0.7 µA under the same conditions. In stop mode, the 32.768 kHz RTC (Timer RE) remains active and can generate interrupts to wake the CPU. The R5F21255SNFP#X6 achieves these currents without external circuitry, relying solely on internal power gating and clock gating.

Is hardware LIN functionality available on the R5F21255SNFP#X6?

Yes, the R5F21255SNFP#X6 integrates a hardware LIN module compliant with LIN 2.0/2.1 specifications, implemented using UART0 and Timer RA. This enables automatic header detection, checksum calculation, and response timing without CPU overhead. The R5F21255SNFP#X6 LIN function requires no external transceiver for basic slave-node operation but needs an external LIN transceiver (e.g., TLE7259) for bus-level signal conditioning and fault protection in master or robust slave roles.