The SH72546R is the third in Renesas Technology's line of high-performance control MCUs employing the 90 nm 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 200 MHz high-speed operation of the SH72544R, the first product in the line, while expanding the on-chip flash memory size by 50% to 3.75 MB, enabling storage of even larger programs. (Note: The second product in the line has lower-grade specifications than the first.)

  The features of the SH72546R are summarized below.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    (1)    Support for large-scale programs with industry's largest on-chip flash memory capacity of 3.75 MB                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     The SH72546R has 3.75 MB of on-chip flash memory, which is 1.5 times as much as the SH72544R, 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 200 MHz.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   The SH72546R also includes 128 Kbytes 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.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         (2)    High-performance CPU core operating at 200 MHz 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 million instructions per second (MIPS) when operating at 200 MHz. 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.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Additionally, 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 90 nm process node to enable large-capacity on-chip flash memory, it supports operation at 200 MHz at temperatures up to 125?C with low power consumption.