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The V850E/IA1 is a product in the V850 Series of NEC Electronics Corporation single-chip microcontrollers. This
chapter provides an overview of the V850E/IA1.
1.1 Outline
The V850E/IA1 is a 32-bit single-chip microcontroller that realizes high-precision inverter control of a motor due to
high-speed operation. It uses the V850E1 CPU of the V850 Series and has on-chip ROM, RAM, bus interface, DMA
controller, a variety of timers including a 3-phase sine wave PWM timer for a motor, various serial interfaces including
FCAN, and peripheral facilities such as A/D converters.
(1) Implementation of V850E1 CPU
The V850E1 CPU supports a RISC instruction set in which instruction execution speeds are increased greatly
through the use of basic instructions that execute one instruction per clock and optimized pipelines.
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 makes a program compact.
Furthermore, since interrupt response time including processing by the on-chip interrupt controller also is fast,
this CPU is suited to the realm of advanced real-time control.
(2) External bus interface function
As the external bus interface, there is a multiplex bus configuration that is an address bus (24 bits) and data
bus (select 8 bits or 16 bits) suitable for compact system design. SRAM and ROM memories can be
connected.
In the DMA controller, a 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 also can 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/IA1 mounted in an
application system. Moreover, it can greatly improve maintainability after a system ships.
(4) Complete middleware, development environment products
The V850E/IA1 can execute JPEG, JBIG, MH/MR/MMR and other middleware fast.
middleware for realizing speech recognition, speech synthesis, and other processing also is provided,
multimedia systems can be realized easily by combining with this middleware.
A development environment that integrates an optimizing C compiler, debugger, in-circuit emulator, simulator,
and system performance analyzer also is provided.
18
CHAPTER 1 INTRODUCTION
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User's Manual U14492EJ5V0UD
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