Renesas R5F12018ASP#50

Overview

R5F12018ASP#50 from Renesas Electronics is an 8 KB flash, 1 KB RAM RL78/G15 10-pin LSSOP microcontroller with 4-channel 8/10-bit ADC, dual simplified I²C, UART, and 8-channel 16-bit timer array - designed for low-power industrial sensor nodes and battery-powered control modules operating from 2.4 V to 5.5 V.

For engineers reviewing the R5F12018ASP#50 datasheet, R5F12018ASP#50 pinout, R5F12018ASP#50 application, or R5F12018ASP#50 equivalent, key selection criteria include its 10-pin LSSOP-0.65mm package, −40°C to +85°C consumer-grade temperature range, on-chip high-speed oscillator (±2.0% accuracy), and integrated comparator with internal reference voltage.

Technical Context

The R5F12018ASP#50 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, supporting minimum instruction execution time of 0.0625 μs at 16 MHz. It integrates a selectable power-on-reset circuit with four detection voltage levels and operates with both high-speed (1–16 MHz) and low-speed (15 kHz) on-chip oscillators.

Its peripheral set includes two simplified SPI (CSI) channels, two simplified I²C channels, one UART channel, and a programmable clock/buzzer output controller (PCLBUZ0). The device supports background operation only for code flash erase/write - data flash rewrite blocks the CPU during execution.

Key Specifications

Pinout & Package

Package: 10-pin plastic LSSOP (4.4 × 3.6 mm, 0.65-mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F12017ASP#50, the R5F12018ASP#50 provides double code flash capacity without changing board layout; versus R5F12048ASP#50, it trades pin count and analog inputs for smaller footprint and lower component count in space-constrained applications.

Availability

R5F12018ASP#50 is available at Aetrix Electronics and suitable for smart home sensor nodes, industrial motor control panels, portable medical monitors, and energy metering subsystems requiring stable component supply and long-term industrial availability.

Supply support for R5F12018ASP#50 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 RL78/G15 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and industrial control applications - emphasizing integrated analog, flexible timing, and robust system-level features.

FAQ

What is the maximum operating frequency and instruction execution time of the R5F12018ASP#50?

The R5F12018ASP#50 supports a maximum high-speed on-chip oscillator frequency of 16 MHz, enabling a minimum instruction execution time of 0.0625 μs. This timing assumes the high-speed oscillator is selected and stabilized; actual performance depends on clock source configuration and peripheral wait states. The device also supports lower frequencies (1/2/4/8 MHz) for reduced power consumption.

Does the R5F12018ASP#50 support external crystal oscillator connections?

No, the R5F12018ASP#50 does not provide X1/X2 pins for external crystal oscillator connection. Its 10-pin LSSOP package omits these pins - unlike 16-pin and 20-pin RL78/G15 variants. It relies solely on the internal high-speed (1–16 MHz) and low-speed (15 kHz) on-chip oscillators for clock generation.

How many analog input channels does the R5F12018ASP#50 support, and what reference voltage options are available?

The R5F12018ASP#50 supports 4 analog input channels (ANI0–ANI3) with 8/10-bit resolution. It provides an internal reference voltage of 0.815 V (TYP.) for the ADC and comparator, and allows selection of either internal or external reference voltage for the comparator (IVCMP0). No external ADC reference input pin is provided in this 10-pin variant.

Can the R5F12018ASP#50 perform simultaneous serial communications using multiple interfaces?

Yes, the R5F12018ASP#50 supports concurrent operation of UART, simplified I²C (up to 2 channels), and simplified SPI (CSI, up to 2 channels) through its Serial Array Unit (SAU0). These interfaces share hardware resources but are independently configurable via the peripheral I/O redirection register (PIOR), allowing simultaneous use - for example, UART for debug, one I²C for sensor readout, and one CSI for display control.

What is the data flash endurance and rewrite unit size for the R5F12018ASP#50?

The R5F12018ASP#50 includes 1 KB of data flash memory with a rated endurance of 1,000,000 write cycles (TYP.). Rewrites occur in 32-bit units, and the memory is organized in 512-byte blocks. Background operation is not supported - CPU execution halts during data flash programming, requiring careful state management in firmware.