At the same time, the introduction of over-the-air (OTA) software updates is proceeding alongside advances in connected car technology. This is creating strong demand for flash memory systems that can provide low-noise flash programming control to enable stable programming during software updates even while driving, a reduction in downtime when switching from the running software to a new version, and a robustness that is sufficient to prevent malfunctions even when an unexpected interruption occurs during updates or while switching software. To make OTA updates more convenient and easier to use, it is necessary to provide separate storage areas for program updates and currently running programs, which is driving further demand for larger flash memory capacities.
In response to the above requirements, Renesas Electronics Corporation (Renesas) has developed a new 28nm MCU embedded flash memory technology with the following features:
- 24 MB embedded flash memory – the industry’s largest in an MCU, combined with high-performance high-k metal gate (HKMG) CMOS logic circuits
- 240 MHz random access read speed – the industry’s fastest for embedded flash memory
- Support for low-noise programming during OTA updates
- Robust and high-speed software switching following OTA updates
Each of these items is described in detail below.