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The V850E/IA2 is a product in NEC Electronics' V850 Series of single-chip microcontrollers. This chapter provides
an overview of the V850E/IA2.
1.1 Outline
The V850E/IA2 is a 32-bit single-chip microcontroller that uses high-speed operations to realize high-precision
inverter control of motors. It uses the V850E1 CPU of the V850 Series and has on-chip peripheral functions such as
ROM, RAM, a bus interface, a DMA controller, timers including a 3-phase sine-wave PWM timer for motors, serial
interfaces, and A/D converters.
(1) V850E1 CPU
The V850E1 CPU supports a RISC instruction set in which the instruction execution speed is increased
greatly through the use of basic instructions that execute one instruction per clock, and an optimized pipeline.
Moreover, it supports multiply instructions using a 32-bit hardware multiplier, saturated product-sum operation
instructions, and bit manipulation instructions as optimum instructions for digital servo control applications.
Object code efficiency is increased in the C compiler by using 2-byte-length basic instructions and
instructions corresponding to high-level languages, which promote a compact program.
Furthermore, 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.
(2) External bus interface function
A bus configuration consisting of a multiplexed address bus (22 bits) and data bus (8 bits or 16 bits
selectable) suitable for compact system design is used as the external bus interface. SRAM and ROM
memories can be connected.
In the DMA controller, transfer is started using software and transfers between external memories can be
made concurrent with internal CPU operations or data transfers. Real-time control such as motor control or
communication control can also be realized simultaneously due to high-speed, high-performance CPU
instruction execution.
(3) On-chip flash memory (
The on-chip flash memory version (
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.
(4) Complete middleware, development environment
The V850E/IA2 can execute JPEG, JBIG, MH/MR/MMR and other middleware at high speeds. Moreover,
since middleware for realizing speech recognition, voice synthesis, and other processing also is provided,
multimedia systems can be realized easily.
A development environment that integrates an optimized C compiler, debugger, in-circuit emulator, simulator,
and system performance analyzer is also provided.
CHAPTER 1 INTRODUCTION
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User's Manual U15195EJ5V0UD
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