Renesas R5F21164DSP#U0

Overview

R5F21164DSP#U0 from Renesas Electronics is a 16-bit R8C/Tiny Series microcontroller in 20-pin LSSOP package, featuring 16 KB flash ROM, 1 KB RAM, 10-bit 4-channel ADC, UART/I²C/serial interface, and three timers (8-bit ×2, 16-bit ×1). It operates from 2.7–5.5 V across –40°C to +85°C and targets embedded control in household appliances and industrial sensors.

For engineers reviewing the R5F21164DSP#U0 datasheet, R5F21164DSP#U0 pinout, R5F21164DSP#U0 application, or R5F21164DSP#U0 equivalent, this page delivers verified specifications, validated pin functions, confirmed operating temperature range (–40°C to +85°C), real-world use cases in sensor-based housing equipment, and two documented alternative parts with explicit functional and memory differences.

Technical Context

The R5F21164DSP#U0 implements the R8C/Tiny CPU core with 89 instructions and executes at 50 ns minimum cycle time (20 MHz XIN, 3.0–5.5 V). Its memory map allocates 1 Mbyte address space, with fixed interrupt vectors at 0FFDCh–0FFFFh and internal RAM starting at 00400h.

It integrates dual clock generation circuits - main crystal/ceramic oscillator (XIN/XOUT) and adjustable high-/low-speed on-chip oscillators - plus oscillation stop detection, voltage monitor, and power-on reset. Peripheral control uses dedicated SFRs mapped to addresses 0000h–002Fh and 0040h–007Fh.

Key Specifications

Pinout & Package

Package: 20-pin plastic molded LSSOP (PLSP0020JB-A), 0.65 mm pitch, surface-mount, JEDEC MS-013AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21164DSP#U0, R5F21164SP lacks industrial temperature support but matches all electrical and functional specs, while R5F21174DSP adds data flash for persistent storage without altering code footprint or timing behavior.

Availability

R5F21164DSP#U0 is available at Aetrix Electronics and suitable for smart thermostat control, industrial sensor nodes, home security keypads, and office equipment motor control requiring stable component supply across extended temperature ranges.

Supply support for R5F21164DSP#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 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/16 Group, including R5F21164DSP#U0, was designed for cost-sensitive, low-power embedded control in consumer and industrial equipment where compact size, integrated peripherals, and extended temperature operation are critical.

FAQ

What is the maximum operating frequency of the R5F21164DSP#U0?

The R5F21164DSP#U0 achieves a minimum instruction execution time of 50 ns when operating at 20 MHz with VCC = 3.0–5.5 V. This corresponds to a maximum reliable system clock frequency of 20 MHz using the main crystal oscillator or high-speed on-chip oscillator. The device supports lower frequencies down to DC in stop mode.

Does the R5F21164DSP#U0 include data flash memory?

No, the R5F21164DSP#U0 belongs to the R8C/16 Group and contains only program flash ROM (16 KB). It does not integrate data flash memory. Data flash (1 KB ×2 blocks) is exclusive to the R8C/17 Group, such as the R5F21174DSP. This distinction is explicitly defined in Renesas documentation.

What are the key differences between R5F21164DSP#U0 and R5F21164SP?

The R5F21164DSP#U0 and R5F21164SP share identical memory (16 KB ROM, 1 KB RAM), peripherals, and pinout. Their sole difference is operating temperature range: R5F21164DSP#U0 is rated –40°C to +85°C (D Version), while R5F21164SP is rated –20°C to +85°C. Both use the same PLSP0020JB-A package.

Which communication interfaces does the R5F21164DSP#U0 support?

The R5F21164DSP#U0 supports three serial interfaces: one UART channel (TXD0/RXD0), one I²C bus interface (SCL/SDA), and one clock-synchronous serial I/O channel (CLK0). All are implemented in hardware and accessible via dedicated pins and SFR-controlled registers.

Can the R5F21164DSP#U0 drive LEDs directly?

Yes, pins P1_0 through P1_3 on the R5F21164DSP#U0 are designated as LED drive ports, capable of sinking up to 20 mA per pin. This allows direct connection of common-anode LEDs without external drivers, simplifying PCB layout in status-indicator applications.