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32bit MCUs run at 64MHz

Posted: 01 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:m32c/80? microcontrollers? mcu? m32c/95? renesas technology america?

Offering twice the speed of its M32C/80 microcontrollers (MCUs), four new M32C/95 MCUs from Renesas Technology America Inc. have up to 768KB of flash and a 3-channel CAN interface among other on-chip peripherals.

Optimized for automotive and industrial applications, the new 64MHz devices feature a high-performance CPU core that speeds program execution. Other key features include a comprehensive set of peripheral functions and 512KB or 768KB of flash memory.

"The M32C/90 series chips are ideal for implementing gateway functions in automotive body controller systems," said Hank Pawlowicz, product marketing manager, system LSI business unit, Renesas Technology America Inc. "For example, a single M32C/95 device can connect three CAN systems, saving cost and simplifying designs that previously required multiple MCUs. They also address pressing needs in industrial, OA, and communications markets for MCUs with the high-speed processing and excellent cost-performance necessary for boosting the intelligence of embedded systems."

The M32C/90 CPU core offers a 15.6ns minimum instruction execution time. It delivers fast processing performance via 32bit processor circuitry and transfer instructions, and by implementing shift instructions with a barrel shifter. The devices minimize power consumption by offering a wait mode and an option to use an on-chip oscillator as the CPU operating clock. To improve system stability, when the Xin external clock is terminated by an external source, the on-chip oscillator automatically starts oscillating to generate another clock.

The on-chip peripheral functions include 16bit timers, DMAC, and A/D converter. Seven serial I/O channels provide LIN master support for systems equipped with communication functions. Additionally, the devices have an on-chip non-stop debugging interface that connects to an external debugger via a single unused pin. Debugging can be performed in the actual operational state using all I/O pins without halting the operation of the MCU, so an embedded system can be evaluated and adjusted when installed in a vehicle, for example. This interface supports serial communication at up to 32Mbps. Thus, it can also be used as a RAM monitor with real-time capability.

To facilitate performance upgrades and software enhancements for existing systems, shorten development times, and reduce hardware/software engineering costs, the new MCUs maintain pin-arrangement compatibility with the devices in the M32C/80, M16C/80, and M16C/60 series, simplifying replacements. The large-capacity on-chip memory the products in the new group provide up to 768KB of flash and 40KB of RAM.

Renesas says it will extend its MCU product lineup to meet evolving market needs. A version with a wide operating temperature range (-40C to 125C) is planned. Another product currently under development will incorporate a 12bit successive-approximation type ADC with a fast, 1.5?s conversion time.

Dependent on packaging type and the amount of on-chip flash and RAM, the MCUs are priced from $28.40 to $35.03 in sampling quantities.

- Marty Gold


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