Renesas R5F21368SYFA#V0

Overview

R5F21368SYFA#V0 from Renesas is a 16-bit R8C CPU core MCU with 64 KB flash program ROM, 6 KB RAM, and 4 KB data flash (1 KB × 4 blocks), operating at up to 20 MHz (2.7–5.5 V) or 5 MHz (1.8–5.5 V). It integrates touch sensor control for 28-channel electrostatic capacitive detection, 10-bit × 12-channel A/D converter, hardware LIN module, and dual UART + I²C/SSU serial interfaces - deployed in consumer audio and office equipment control systems.

For engineers reviewing the R5F21368SYFA#V0 datasheet, R5F21368SYFA#V0 pinout, R5F21368SYFA#V0 application, or R5F21368SYFA#V0 equivalent, key selection criteria include its 64-pin LQFP package (PLQP0064GA-A), -40°C to +85°C industrial temperature grade (D version), background operation (BGO) for data flash writes, and integrated TSCU enabling low-pin-count touch UI without external ICs.

Technical Context

The R5F21368SYFA#V0 implements the R8C CPU core with 89 fundamental instructions, 1 Mbyte address space, and 16×16→32-bit hardware multiplier supporting multiply-accumulate operations. Its clock system includes four independent sources: XIN/XOUT crystal oscillator, XCIN/XCOUT low-power crystal oscillator, high-speed on-chip oscillator (adjustable), and low-speed on-chip oscillator - all selectable via software-controlled frequency dividers (÷1, ÷2, ÷4, ÷8, ÷16).

Peripheral integration centers on event-driven architecture: Event Link Controller (ELC) enables 30 source × 10 operation types for inter-peripheral triggering without CPU intervention; Data Transfer Controller (DTC) provides single-channel DMA with 27 activation sources; and dedicated timer subsystems (RJ, RB2, RC, RE2) support PWM generation, input capture, real-time clock, and pulse width/period measurement - all synchronized to the selected clock domain.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (PLQP0064GA-A), 0.8 mm pin pitch, 14 mm × 14 mm body size, exposed pad not specified. Pin functions validated per Renesas R01DS0055EJ0100 datasheet Figures 1.3 and Tables 1.4–1.8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21368SYFA#V0, the R5F2136CSYFA#V0 offers scalable code space for complex protocols, while the R5F21368SNFA#V0 reduces cost by relaxing temperature qualification - both retain identical pinout, peripheral functionality, and toolchain compatibility.

Availability

R5F21368SYFA#V0 is available at Aetrix Electronics and suitable for audio equipment control, office equipment UI, consumer appliance interface, and industrial HMI panel applications requiring stable component supply and long-term industrial temperature support.

Supply support for R5F21368SYFA#V0 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, power, and SoC solutions for automotive, industrial, and IoT markets.

The R8C/36T-A Group targets cost-sensitive, low-power embedded control applications requiring integrated touch sensing, mixed-signal peripherals, and robust industrial temperature operation - designed specifically for consumer electronics and office automation.

FAQ

What is the maximum operating frequency of the R5F21368SYFA#V0 and under what voltage conditions?

The R5F21368SYFA#V0 operates at up to 20 MHz when supplied with 2.7 V to 5.5 V, and at up to 5 MHz when supplied with 1.8 V to 5.5 V. These specifications are confirmed in Table 1.2 of the R01DS0055EJ0100 datasheet. The R5F21368SYFA#V0 uses the high-speed on-chip oscillator or external crystal (XIN/XOUT) for full-speed operation, with frequency division options configurable via CM1 register bits.

Does the R5F21368SYFA#V0 support background operation (BGO) for data flash writes?

Yes, the R5F21368SYFA#V0 supports background operation (BGO) for its 4 KB data flash (1 KB × 4 blocks), allowing program execution to continue uninterrupted during flash erase/write cycles. This capability is explicitly documented in Section 1.1 and Table 1.2 of the R01DS0055EJ0100 datasheet. The R5F21368SYFA#V0 uses dedicated SFRs (e.g., FLMCR, FLMDR) to manage BGO status and completion interrupts.

How many touch sensing channels does the R5F21368SYFA#V0 support and what interface do they use?

The R5F21368SYFA#V0 supports 28 electrostatic capacitive touch sensing channels via its integrated Touch Sensor Control Unit (TSCU), using dedicated pins including CHxA0, CHxB, CHxC, and CH00–CH35. This is confirmed in Section 1.1 and Table 1.2 of the R01DS0055EJ0100 datasheet. The R5F21368SYFA#V0 performs charge-transfer timing measurements internally, eliminating need for external RC networks or dedicated touch ICs.

What serial communication interfaces are integrated into the R5F21368SYFA#V0?

The R5F21368SYFA#V0 integrates UART0_0, UART0_1 (2 channels), UART2 (1 channel with I²C mode), SSU/I²C_0 (shared function), and a hardware LIN module (HW-LIN_0). UART2 supports clock synchronous/asynchronous serial I/O, I²C-bus, and multiprocessor communication modes - all verified in Table 1.2 and Figure 1.2 of the R01DS0055EJ0100 datasheet. The R5F21368SYFA#V0 shares pins between SSU and I²C functions, requiring software configuration to select active mode.

What is the operating temperature range and package type of the R5F21368SYFA#V0?

The R5F21368SYFA#V0 is rated for -40°C to +85°C (D version) and housed in a 64-pin LQFP package with code PLQP0064GA-A (0.8 mm pitch, 14 mm × 14 mm body). This information is specified in Table 1.2 and Figure 1.1 of the R01DS0055EJ0100 datasheet. The R5F21368SYFA#V0's package includes standard thermal pad recommendations per Renesas mounting guidelines.