Renesas R5F21346CNFP#U0

Overview

R5F21346CNFP#U0 from Renesas is a 16-bit R8C CPU core MCU with 32 KB flash program ROM, 2.5 KB RAM, and 4 KB data flash (1 KB × 4 blocks) supporting background operation (BGO). It delivers 50 ns minimum instruction execution at 20 MHz (VCC = 2.7–5.5 V), integrates dual 8-bit timers (RA/RB), dual 16-bit timers (RC/RD), real-time clock (RE), 10-bit × 12-channel ADC, dual 8-bit DACs, LIN hardware module, and I²C/UART/SSU serial interfaces - deployed in consumer audio and office equipment control systems.

For engineers reviewing the R5F21346CNFP#U0 datasheet, R5F21346CNFP#U0 pinout, R5F21346CNFP#U0 application, or R5F21346CNFP#U0 equivalent, this page provides verified package mapping (48-pin LQFP PLQP0048KB-A), confirmed peripheral register layout, validated low-power operating modes (wait/stop), and two documented alternative parts for design continuity in cost- or temperature-sensitive embedded applications.

Technical Context

The R5F21346CNFP#U0 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. Its memory map spans 1 Mbyte (00000h–FFFFFh), with program ROM at 08000h–0FFFFh, data flash at 03000h–03FFFh, and RAM at 00400h–00DFFh - all accessible via 20-bit PC and dual register banks.

Peripheral integration includes UART0/1/2 (with I²C mode on UART2), SSU shared with I²C-bus, hardware LIN using timer RA and UART0, DTC with 33 activation sources, and voltage detection circuitry supporting power-on reset and dual-level voltage monitoring - all managed through dedicated SFRs mapped to 0000h–02FFFh address space.

Key Specifications

Pinout & Package

Package: 48-pin LQFP (PLQP0048KB-A), 7 mm × 7 mm, 0.5 mm pitch - RoHS-compliant surface-mount package compatible with standard reflow profiles and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21345CNFP, R5F21346CNFP#U0 provides 8 KB more program storage for feature-rich firmware and larger data tables; compared with R5F21346CDFP, it trades industrial temperature grade for lower cost in commercial-grade consumer applications where thermal margins are sufficient.

Availability

R5F21346CNFP#U0 is available at Aetrix Electronics and suitable for audio equipment control, office equipment motor drive, consumer appliance UI, and home automation sensor hub applications requiring stable component supply and long-term production continuity.

Supply support for R5F21346CNFP#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 is a global semiconductor leader specializing in microcontrollers, analog, and power management ICs for automotive, industrial, and consumer markets.

The R8C/34C Group, including R5F21346CNFP#U0, was designed for cost-sensitive, low-power embedded control in consumer electronics - emphasizing integrated analog peripherals, LIN connectivity, and robust flash reliability for mass-market appliance and audio applications.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for the R5F21346CNFP#U0?

The R5F21346CNFP#U0 operates at up to 20 MHz when supplied with 2.7–5.5 V, achieving a minimum instruction execution time of 50 ns. At reduced clock speeds (e.g., 5 MHz), it supports down to 1.8 V supply - enabling flexible power scaling in battery-powered or wide-input-range consumer devices. This dual-voltage/frequency capability is explicitly defined in Table 1.2 of the R01DS0007EJ0100 datasheet.

Does the R5F21346CNFP#U0 support in-circuit debugging and flash programming?

Yes, the R5F21346CNFP#U0 includes on-chip debug functionality and on-board flash rewrite capability, allowing full firmware development and field updates without external programmers. Its debug interface uses the standard Renesas E8/E8a emulator connection, and flash security features include ROM code protection and ID code verification - all confirmed in Section 1.1.2 and Table 1.2 of the datasheet.

How many analog input channels does the R5F21346CNFP#U0 ADC support, and what is its resolution?

The R5F21346CNFP#U0 integrates a 10-bit resolution successive-approximation ADC with 12 dedicated analog input channels (AN0–AN11), plus sample-and-hold and hardware sweep mode. This allows simultaneous multi-sensor acquisition - such as temperature, voltage, and current monitoring - without external multiplexers or signal conditioning, as specified in Table 1.2 and Section 1.1.2 of the datasheet.

What peripheral modules enable LIN bus communication on the R5F21346CNFP#U0?

The R5F21346CNFP#U0 implements hardware LIN 2.0/2.1 communication using the dedicated LIN module, which combines timer RA for baud rate generation and UART0 for data framing - eliminating software bit-banging. This integrated approach ensures timing accuracy and reduces CPU load, as detailed in Section 1.1.2 and Figure 1.2 of the R01DS0007EJ0100 datasheet.

What are the low-power operating modes supported by the R5F21346CNFP#U0, and what is the typical current draw in each?

The R5F21346CNFP#U0 supports wait mode (3.5 µA @ 3.0 V, 32 kHz XCIN) and stop mode (2.0 µA @ 3.0 V), in addition to standard high-/low-speed clock operation. These modes disable CPU and selected peripherals while retaining RAM content and interrupt wake capability - critical for battery longevity in remote controls and smart sensors, as quantified in Table 1.2 of the datasheet.