MCU runs two motors at once

The latest device in NEC's successful V850-Series of RISC based MCUs is optimised for inverter control applications and is capable of controlling two three-phase motors simultaneously.

The latest device in NEC's successful V850-Series of RISC based MCUs is optimised for inverter control applications and is capable of controlling two three-phase motors simultaneously.

The V850E/IA2 is a 32bit single-chip microcontroller that uses high-speed operations to realise high-precision inverter control of motors.

It uses the V850E1 CPU of the V850 series running at 40MHz and has on-chip peripheral functions such as ROM, RAM, a bus interface, A DMA controller, timers including a three-phase sinewave PWM timer for motors, serial interfaces and A/D converters.

Two separate high-speed three-phase PWM units can be used to control two motors.

This device features two outputs with hardware emergency shutoff function, centred 16bit PWM signals and 12bit dead-time timers.

Two 10bit resolution A/D convertor units are included, one with six and the other with eight channels.

The V850E1 is a RISC based CPU in which the execution speed is increased greatly as a result of basic instructions that execute in a single clock and an optimised pipeline.

It also supports multiple instructions using a 32bit hardware multiplier, saturated product-sum operations, and dedicated instructions for bit manipulation and digital servo control applications.

Object code efficiency is increased in the C complier by using instructions corresponding to high-level languages, which promote a compact program.

Since the interrupt response time, including processing by the on-chip interrupt controller is also fast, this CPU is ideal for advanced real-time control.

Two variants have onboard 128Kbit Flash memory or 128Kbit mask ROM.

Both have 6Kbit RAM.

A multiplexed address bus (22bit) and data bus (8 or 16bit selectable) suitable for compact system design is used as the external bus interface allowing SRAM and ROM memories to be connected in a 4Mbyte linear address range.

In the DMA controller, transfer is started using software and transfer between external memories can be made concurrent with internal CPU operations of data transfers.

Real-time control such as motor control or communication control can also be realised simultaneously due to high-speed, high-performance CPU instruction execution.

The Flash memory version (UPD70F3114), which has a quickly accessible Flash memory on-chip, can shorten system development time since it is possible to rewrite a program with the V850E/IA2 mounted in an application system.

Moreover, it can greatly improve maintainability after a system is shipped.

A development environment is available that integrates an optimised C complier, debugger, in-circuit emulator, as well as a simulator and system performance analyser.

In final systems, the V850E/IA2 offers a smaller footprint than the earlier V850E/IA1 as it is packaged in a 100-pin LQFP.

Additional design information and samples are available now from Sunrise Electronics.

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