Renesas R5F21334CDFP#X6

Overview

R5F21334CDFP#X6 from Renesas is a 16-bit R8C CPU core MCU with 16 KB flash program ROM, 1.5 KB RAM, and 4 KB data flash (1 KB × 4 blocks) supporting background operation (BGO). It operates at up to 20 MHz (VCC = 2.7–5.5 V), integrates 10-bit × 12-channel A/D, dual 8-bit D/A, LIN hardware module, and real-time clock (Timer RE), targeting embedded control in consumer audio and office equipment.

For engineers reviewing the R5F21334CDFP#X6 datasheet, R5F21334CDFP#X6 pinout, R5F21334CDFP#X6 application, or R5F21334CDFP#X6 equivalent, key selection considerations include its -40°C to +85°C industrial temperature grade (D version), 32-pin LQFP package (PLQP0032GB-A), integrated voltage detection circuitry, and support for low-power wait/stop modes with typical current as low as 2.0 µA.

Technical Context

The R5F21334CDFP#X6 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 fixed interrupt vector table at 0FFDCh–0FFFFh and data flash allocated at 03000h–03FFFh.

It features four independent clock sources - XIN/XOUT (up to 20 MHz), XCIN/XCOUT (32 kHz), high-speed on-chip oscillator (adjustable), and low-speed on-chip oscillator - with selectable frequency dividers (1/2/4/8/16) and oscillation stop detection. Peripheral integration includes UART0/1/2, I²C-bus, SSU, three 8-bit timers (RA/RB/RE), one 16-bit timer (RC), watchdog timer, DTC, comparator B, and LIN protocol engine using Timer RA and UART0.

Key Specifications

Pinout & Package

32-pin LQFP package (PLQP0032GB-A), 7 mm × 7 mm body, 0.8 mm pin pitch, exposed pad not present. Pin functions support multiplexed peripheral assignment via software configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21334CNFP, the R5F21334CDFP#X6 offers guaranteed operation down to -40°C - critical for industrial deployments - while R5F21336CDFP provides double the flash and RAM for complex control algorithms without changing PCB layout.

Availability

R5F21334CDFP#X6 is available at Aetrix Electronics and suitable for audio equipment control, office equipment motor control, consumer appliance UI panels, and industrial sensor nodes requiring stable component supply across extended temperature ranges.

Supply support for R5F21334CDFP#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 is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The R8C/33C Group, including R5F21334CDFP#X6, was designed for cost-sensitive, low-power embedded control in consumer and industrial appliances where integration, reliability, and extended temperature operation are essential.

FAQ

What is the maximum operating frequency of the R5F21334CDFP#X6?

The R5F21334CDFP#X6 supports a maximum operating frequency of 20 MHz when powered at VCC = 2.7–5.5 V using the XIN clock source. At lower supply voltages (1.8–5.5 V), the maximum frequency is reduced to 5 MHz. The on-chip high-speed oscillator also supports adjustable frequencies, enabling clock flexibility without external components.

Does the R5F21334CDFP#X6 support in-circuit debugging?

Yes, the R5F21334CDFP#X6 includes on-chip debug functionality compliant with Renesas' standard debug interface. It supports full breakpoint, step-through, and register/memory inspection via dedicated debug pins (not shared with user I/O), enabling development without requiring external emulators beyond standard E8/E10 debug adapters.

How many A/D input channels does the R5F21334CDFP#X6 have, and what is their resolution?

The R5F21334CDFP#X6 integrates a 10-bit successive-approximation A/D converter with 12 input channels (AN0–AN11). It supports sample-and-hold operation and automatic channel sweep mode, allowing sequential conversion of all enabled channels with minimal CPU intervention - ideal for multi-sensor monitoring systems.

Is the R5F21334CDFP#X6 pin-compatible with other devices in the R8C/33C Group?

Yes, all R8C/33C Group MCUs, including R5F21334CDFP#X6, share the identical 32-pin LQFP package (PLQP0032GB-A) and pinout. This allows direct substitution between variants (e.g., R5F21332CDFP, R5F21336CDFP) on the same PCB - only firmware and optional external components (e.g., crystal load caps) may require adjustment.

What is the purpose of the data flash in the R5F21334CDFP#X6?

The R5F21334CDFP#X6 includes 4 KB of data flash (1 KB × 4 blocks) specifically designed for nonvolatile parameter storage and firmware updates. With Background Operation (BGO) support, it enables read-modify-write operations while the main program continues executing - essential for logging runtime data or applying field updates without system interruption.