Renesas R5F12008ASN#50

Overview

R5F12008ASN#50 from Renesas Electronics is an 8-pin RL78/G15 16-bit microcontroller with 8 KB code flash, 1 KB RAM, and 1 KB data flash, operating from 2.4 V to 5.5 V. It integrates a high-speed on-chip oscillator (1–16 MHz), 8-channel 16-bit timer array, 3-channel 8/10-bit ADC, single comparator, UART, simplified I²C, and simplified SPI - targeted for low-power consumer-grade embedded control in space-constrained applications.

For engineers reviewing the R5F12008ASN#50 datasheet, R5F12008ASN#50 pinout, R5F12008ASN#50 application, or R5F12008ASN#50 equivalent, this page delivers verified functional scope, validated pin mapping for SOP-8 package, real-world timing and interface constraints, and direct alternative options with documented technical trade-offs for cost, temperature, or peripheral scaling.

Technical Context

The R5F12008ASN#50 implements the RL78-S2 CPU core with CISC architecture and 3-stage pipeline, supporting minimum instruction execution time of 0.0625 μs at 16 MHz using the high-speed on-chip oscillator. Its memory subsystem includes 8 KB code flash (1 KB block size), 1 KB data flash (512 B block, 1M rewrite cycles), and 1 KB SRAM - all accessible under single-supply operation from 2.4 V to 5.5 V.

Peripherals are tightly integrated via the TAU0 timer array (8 channels), SAU0 serial array (2 channels supporting UART/CSI/IICA), and analog subsystem comprising 3-channel ADC (8/10-bit, internal 0.815 V reference), 1 comparator, and programmable clock/buzzer output (PCLBUZ0). Reset and power management include selectable SPOR with four voltage thresholds and HALT/STOP low-power modes.

Key Specifications

Pinout & Package

Package: 8-pin plastic SOP (SOIC), 3.9 × 4.9 mm, 1.27-mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F12008ASN#50, R5F12007ASN#50 reduces flash capacity without altering pin compatibility or power profile, while R5F12018ASP#50 trades package compactness for peripheral scalability - making the former ideal for cost-optimized derivatives and the latter for feature-expanded designs.

Availability

R5F12008ASN#50 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, consumer IoT remotes, smart lighting drivers, and battery-powered metering systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for R5F12008ASN#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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets with emphasis on reliability and energy efficiency.

The RL78/G15 product line targets ultra-low-power, cost-sensitive embedded control applications - designed specifically for consumer and industrial equipment where small footprint, single-supply operation, and integrated analog peripherals reduce BOM count and design complexity.

FAQ

What is the maximum operating frequency and instruction timing of the R5F12008ASN#50?

The R5F12008ASN#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 is achievable only when the high-speed oscillator is selected and stabilized - the device defaults to this clock post-reset but requires software verification of oscillation stability via the OSTC register before switching from the default 15 kHz low-speed clock.

Does the R5F12008ASN#50 support in-system programming and data retention during rewrites?

Yes, the R5F12008ASN#50 supports in-system programming of both code flash and data flash without external hardware. Data flash offers 1,000,000 write/erase cycles (typical) with 32-bit rewrite granularity and operates across the full VDD range of 2.4 V to 5.5 V - enabling reliable parameter storage and firmware updates in deployed R5F12008ASN#50 units.

What analog peripherals are integrated into the R5F12008ASN#50 and how are they configured?

The R5F12008ASN#50 integrates a 3-channel 8/10-bit ADC with VDD reference and internal 0.815 V reference, plus one comparator (IVCMP0) with selectable internal or external reference voltage. Both ADC and comparator share analog input pins (ANI0, ANI2, ANI3), and configuration is performed via dedicated control registers - no external components are needed for basic analog sensing in the R5F12008ASN#50.

Can the R5F12008ASN#50 operate across extended temperature ranges, and what grade does the #50 suffix indicate?

The R5F12008ASN#50 is rated for TA = −40°C to +85°C, corresponding to the 'A' (consumer) grade per Renesas part numbering. The '#50' suffix denotes embossed tape packaging for SOP/WDFN/SSOP packages - it does not indicate temperature grade. For industrial operation up to +105°C (G grade) or +125°C (M grade), alternate part numbers such as R5F12008GNS#50 or R5F12008MNS#50 must be selected.

What debug and development support is available for the R5F12008ASN#50?

The R5F12008ASN#50 includes an on-chip debug interface accessible via TOOL0, TOOLRxD, and TOOLTxD pins - compatible with Renesas E2 emulator and CS+ IDE. Debug functionality supports full break/trace, flash programming, and register inspection. However, Renesas cautions against using the debug interface in mass-produced units due to potential flash endurance impact from repeated debug access cycles.