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Automotive MCU packs 3.75MB flash memory

Posted: 14 Sep 2009 ?? ?Print Version ?Bookmark and Share

Keywords:microcontroller? MCU? automotive control MCU? flash memory?

SH72546R MCU

Renesas Technology Corp. has expanded its SuperH family of microcontrollers with the SH72546R, a powertrain control MCU that combines the on-chip flash memory capacity of 3.75Mbyte and high-speed operation at 200MHz.

The SH72546R is the third in Renesas' line of high-performance control MCUs employing the 90nm process node to integrate large-capacity flash memory. It is designed for powertrain control applications, which demand more fine-grained and agile response to achieve environmental goals such as reduced exhaust emissions and improved fuel economy. It retains the 200MHz high-speed operation of the SH72544R, the first product in the line, while expanding the on-chip flash memory size by 50 percent to 3.75Mbyte, enabling storage of even larger programs.

The SH72546R features support for large-scale programs with 3.75Mbyte of on-chip flash memory, is 1.5x as much as the first product in the line. This allows storage of large-scale programs for implementing more fine-grained and high-precision control of the engine or transmission. Generally, a flash memory has a slower maximum operating speed than a logic circuit due to its operating principle. In addition to using Renesas' unique technologies to increase the speed of the flash memory in this product, the SH72546R also features a low-power cache system to optimize the use of flash memory. Not only do these technologies minimize increases in power consumption, but they achieve performance essentially equal to single-cycle access at 200MHz. The SH72546R also includes 128Kbyte of flash memory with functions essentially equivalent to those of EEPROM for data storage. Using this on-chip flash memory can obviate the need for external memory and thus contribute to reduced system costs.

In addition, the device's high-performance CPU core operates at 200MHz for sophisticated real-time control and low power consumption. Like the SH72544R, the first product in the line, the SH72546R delivers excellent processing performance of 400 MIPS when operating at 200MHz. This enables it to achieve sophisticated real-time control involving the more fine-grained and high-speed complex operation processing demanded by engine or transmission control applications.

Also, the SH72546R is able to withstand high environmental temperatures, something that is difficult to achieve in MCUs with on-chip flash memory. Though fabricated using the 90nm process node to enable large-capacity on-chip flash memory, it supports operation at 200MHz at temperatures up to 125C with low power consumption. The SH72546R can therefore be mounted in the high-temperature environment of engine or transmission applications, allowing for a simpler system design.

The MCU also offers an extensive set of peripheral functions designed for engine and transmission control system. The SH72546R includes a rich set of peripheral functions. In addition to a multifunction timer (ATU-III: Advanced Timer Unit III), which is useful for both engine and transmission control, the SH72546R also features a high-speed 12bit ADC, CAN interface, and high-speed serial interface functions. The SH72546R can thus implement high-precision real-time control in a small mounting area.

It is completely compatible with SH72546RFCC for program development. The functions and package are fully compatible with the SH72546RFCC control MCU for program development The SH72546RFCC is a microcontroller intended to be used by customers in the development of MCU software. It predates both the new SH72546R, and even the first product in the line, and includes large-capacity emulation RAM for highly efficient debugging. Customers can easily transfer to the new SH72546R systems developed using the SH72546RFCC. This enables a decrease in overall system development time. The SH72546R is also fully function-, package-, and pin-compatible with the SH72544R, the first product in the line. This allows system hardware and software design resources developed for the SH72544R to be adapted to the SH72546R quickly and seamlessly.

In the automotive field in recent years, exhaust emissions standards have been strengthened in the interest of environmental preservation, and demand has increased for improved fuel economy. This has created a need for more highly precise control in powertrain control systems for the engine, transmission, etc. In turn, in the MCUs used to control such systems, there is increasing demand for a higher level of processing performance to handle the high-speed and complex operation processing required on the one hand, and for larger-capacity on-chip flash memory to accommodate the large-scale programs needed for fine-grained control on the other. In addition, it is becoming more important to be able to reuse existing resources when developing systems incorporating MCUs to enable quicker system development and reduced cost.


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