Renesas R5F21206KFP#U1

Overview

R5F21206KFP from Renesas Electronics is a 16-bit R8C/20 Group microcontroller with 32 KB flash program memory, 2 KB RAM, and an R8C CPU core operating at up to 20 MHz (50 ns min instruction time). It features a 10-bit 12-channel ADC, dual UARTs, hardware LIN module (using Timer RA and UART0), I²C interface, and 41 GPIO pins in a 48-pin LQFP package - used in automotive body control modules requiring extended temperature operation.

For engineers reviewing the R5F21206KFP datasheet, R5F21206KFP pinout, R5F21206KFP application, or R5F21206KFP equivalent, key selection criteria include its -40°C to +125°C operating range (K version), absence of embedded data flash (R8C/20 Group), single-chip operation mode, and peripheral set optimized for cost-sensitive automotive subsystems with LIN bus integration.

Technical Context

The R5F21206KFP implements the R8C CPU core with 89 fundamental instructions and a 1 Mbyte address space. Its clock system includes dual on-chip oscillators (high-speed with frequency adjustment, low-speed) plus external XIN/XOUT support for crystal or ceramic resonator operation.

Peripheral integration includes Timer RA (8-bit, with I/O), Timer RB (8-bit), Timer RD (16-bit ×2, with input capture/output compare), Timer RE (8-bit output), watchdog timer (15-bit with prescaler), and interrupt controller supporting 7 priority levels across 11 internal, 5 external, and 4 software sources.

Key Specifications

Pinout & Package

Package: 48-pin plastic LQFP (PLQP0048KB-A), 7 mm × 7 mm body, 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21206JFP, the R5F21206KFP provides guaranteed operation at 125°C for under-hood placement, while R5F21216KFP adds data flash for runtime configuration storage - making the R5F21206KFP optimal for fixed-function, high-temp automotive slaves where flash endurance and cost are critical.

Availability

R5F21206KFP is available at Aetrix Electronics and suitable for automotive body electronics, industrial temperature controllers, and consumer appliance control systems requiring stable component supply across extended temperature ranges.

Supply support for R5F21206KFP 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/20 Group, including R5F21206KFP, was designed for cost-optimized, real-time automotive subsystems requiring LIN connectivity, analog sensing, and robust operation in harsh environments.

FAQ

What is the maximum operating frequency and supply voltage range for the R5F21206KFP?

The R5F21206KFP operates at up to 20 MHz with a supply voltage range of 3.0 V to 5.5 V. This specification applies specifically to the K version (–40°C to +125°C), and the minimum instruction execution time is 50 ns under those conditions. The device also supports 10 MHz operation down to 2.7 V, enabling flexible power design in automotive 12 V systems with regulator tolerance.

Does the R5F21206KFP include embedded data flash memory?

No, the R5F21206KFP belongs to the R8C/20 Group and does not include embedded data flash. It contains only 32 KB of program flash memory and 2 KB of RAM. Data flash (1 KB ×2 blocks) is exclusive to the R8C/21 Group, such as the R5F21216KFP. This distinction is confirmed in Renesas documentation Table 1.1 and Table 1.2.

Which peripherals support LIN bus communication on the R5F21206KFP?

The R5F21206KFP implements hardware LIN 2.0/2.1 functionality using the combination of Timer RA and UART0, as explicitly stated in Table 1.1 and Table 1.2 of the Renesas documentation. No additional peripheral configuration or external components are required to achieve LIN slave node operation.

What is the purpose of the MODE pin on the R5F21206KFP?

The MODE pin on the R5F21206KFP must be externally pulled high to VCC via a resistor to configure the device for normal single-chip operation. This setting determines boot mode and memory mapping behavior, and leaving it unconnected or pulled low may result in undefined startup behavior or emulator mode activation.

How many analog input channels does the R5F21206KFP support, and what is their resolution?

The R5F21206KFP integrates a single 10-bit successive-approximation A/D converter with 12 analog input channels (AN0–AN11), as specified in Tables 1.1 and 1.2. These channels are distributed across P0, P1, and P4 pins and support simultaneous sampling only in sequence mode - no hardware averaging or differential input capability is included.