Renesas R5F21191SP#U0

Overview

R5F21191SP#U0 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/19 Group, featuring an R8C/Tiny Series CPU core, 4 KB program flash ROM, 2 KB data flash (1 KB × 2 blocks), and 384 bytes RAM. It operates at up to 20 MHz (50 ns min instruction time), supports 13 I/O pins including LED drive capability, and integrates timers (X/Z/C), UART, clock-synchronous serial I/O, a 4-channel comparator, and on-chip oscillators. It targets embedded control in household appliances and industrial sensors.

For engineers reviewing the R5F21191SP#U0 datasheet, R5F21191SP#U0 pinout, R5F21191SP#U0 application, or R5F21191SP#U0 equivalent, key selection considerations include its 20-pin LSSOP package (PLSP0020JB-A), -20°C to +85°C operating range, dual flash memory architecture (program + data), low-power stop mode (0.7 µA), and integrated voltage detection and watchdog timer.

Technical Context

The R5F21191SP#U0 implements the R8C/Tiny CPU core with 89 fundamental instructions and a 20-bit program counter, enabling 1 Mbyte address space access. Its memory subsystem separates 4 KB program flash (for code) from 2 KB data flash (for nonvolatile parameter storage), both erasable/programmable at VCC = 2.7–5.5 V with 10,000-cycle endurance for data flash.

Peripheral integration includes Timer C (16-bit input capture/output compare), two 8-bit timers (X and Z), dual UART channels, one clock-synchronous serial interface, and a 1-bit comparator with four analog inputs (AN8–AN11). Clock generation uses either external crystal (XIN/XOUT) or internal high-speed oscillator with frequency adjustment.

Key Specifications

Pinout & Package

Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 7.6 mm × 4.4 mm body, 0.65 mm lead pitch, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21191SP#U0, R5F21192SP offers scalable code space without altering hardware design, while R5F21181SP removes data flash to reduce cost at the expense of field-updatable storage - making R5F21191SP#U0 optimal for applications needing embedded parameter persistence.

Availability

R5F21191SP#U0 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and office equipment motor control requiring stable component supply and long-term production continuity.

Supply support for R5F21191SP#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/19 Group, including R5F21191SP#U0, was designed for cost-sensitive, low-power embedded control in consumer and industrial equipment where integrated data flash and compact LSSOP packaging deliver system-level BOM reduction.

FAQ

What is the maximum operating frequency of the R5F21191SP#U0?

The R5F21191SP#U0 achieves a minimum instruction execution time of 50 ns at 20 MHz when powered at 3.0–5.5 V, confirming its maximum guaranteed operating frequency is 20 MHz under those supply conditions. At lower voltages (2.7–5.5 V), the rated max frequency drops to 10 MHz (100 ns min instruction time).

Does the R5F21191SP#U0 include on-chip debug support?

Yes, the R5F21191SP#U0 supports on-chip debugging via the single-wire background debug mode (BDM) interface using the RESET pin, enabling full breakpoint, step, and memory inspection capabilities without requiring additional debug pins or external JTAG hardware.

How many analog input channels does the comparator in R5F21191SP#U0 support?

The R5F21191SP#U0 integrates a 1-bit comparator with four dedicated analog input channels: AN8, AN9, AN10, and AN11 - each mapped to specific pins (P1_0, P1_1, P1_2, P1_3) and usable simultaneously for independent threshold comparisons.

What is the endurance rating for the data flash memory in R5F21191SP#U0?

The data flash memory in R5F21191SP#U0 is rated for 10,000 erase/program cycles, significantly higher than the 1,000-cycle endurance of its program flash ROM - making it suitable for frequently updated calibration data, device settings, or usage logs.

Is the R5F21191SP#U0 pin-compatible with other R8C/19 Group devices in the same package?

Yes, all R8C/19 Group MCUs in the PLSP0020JB-A (20-pin LSSOP) package - including R5F21191SP#U0, R5F21192SP, R5F21193SP, and R5F21194SP - share identical pinouts, electrical characteristics, and peripheral mappings, enabling drop-in firmware upgrades based on memory requirements.