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{{cite press release |language=en |publisher=Renesas Electronics |access-date=2024-06-06 |date=2010-11-17 |title=Renesas Electronics Introduces the New RL78 Microcontroller Family to Deliver Solutions for Next-Generation 8-/16-bit Embedded Applications |website=Business Wire |url=https://www.businesswire.com/news/home/20101117006818/en/Renesas-Electronics-Introduces-New-RL78-Microcontroller-Family |archive-url=https://web.archive.org/web/20180318120737/https://www.businesswire.com/news/home/20101117006818/en/Renesas-Electronics-Introduces-New-RL78-Microcontroller-Family |archive-date=2018-03-18 |url-status=dead}}</ref> These Microcontrollers incorporate the core features of the NEC 78K0R (150 nm MF2 flash process) and many familiar peripherals from legacy Renesas R8C microcontrollers. The RL78 core variants include the S1, S2, and S3 type cores which evolved from the NEC 78K0R core. The basic S1 core support 74 instructions, the S2 core adds register banking and supports 75 instructions, while the S3 core adds an on-chip multiplier / divider / multiple-accumulate and supports 81 instructions.
The RL78 was developed to address extremely low power but highly integrated microcontroller applications,<ref>{{cite web|access-date=2024-06-06 |date=2010-11-28 |title=Renesas Electronics Introduces the New RL78 Microcontroller Family for Next-Generation 8-/16-bit Embedded Applications |publisher=eepower.com |url=https://eepower.com/new-industry-products/renesas-electronics-introduces-the-new-rl78-microcontroller-family-for-next-generation-8-16-bit-embedded-applications/}}</ref> to this end the core offered a novel low power mode of operation called “snooze mode”<ref>{{cite web|access-date=2024-06-06 |date=2022-07-06 |title=Renesas RL78 - 0. Family Lineup and Features |publisher=circuitbread.com |url=https://www.circuitbread.com/tutorials/renesas-rl78-0-family-lineup-and-features}}</ref> where the ADC or serial interface can be programmed to meet specific conditions to wake the device from the extreme low power STOP mode of 0.52uA.
==== The RX MCU family ====
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