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SCI to SPI Peripheral Communication in V850ES Microcontrollers

1. INTRODUCTION

The purpose of this document is to provide simple examples that will help you better understand

functionality of the peripherals included in the NEC Electronics V850ES™ MCU.

This document includes

• Description of peripheral features

• Example program descriptions and specifications

• Software flowcharts

• Applilet reference drivers

• Demonstration platforms used

• Hardware block diagram

• Software modules

Applilet is a software tool that generates driver code for the peripherals. It is a convenient means to

generate code for the on-chip peripherals for quick evaluation.

For more information about V850ES MCUs or the Applilet code generator, refer to their respective user's

manuals.

2. NEC ELECTRONICS CSI TO SPI COMMUNICATION

The NEC Electronics clocked serial I/O (CSI) peripheral communication method, also known as 3-wire

serial I/O, uses three lines: serial clock (SCK), data input (SI) and data output (SO). In some cases, one

additional line is used as a handshake (HS) between master and slave for simultaneous transmission and

reception. The data transmission and reception is done in synchronization with the SCK clock, making

communication simple and straightforward. Most NEC Electronics MCUs implement one or more

channels of CSI peripheral hardware.

An alternate method to the CSI interface is the serial peripheral interface (SPI). The SPI also uses SCK,

SI, and SO. To support master-slave configuration, the SPI also uses a slave-select (SS_B) signal to select

a communicating peripheral. SPI data transmission and reception is also done in synchronization with the

clock.

The implementation, clocking, and control methods for NEC Electronics’ CSI and SPI are both similar

and different in hardware. This document will review both and provide reference examples so that the two

communication methods can be used interchangeably, without additional hardware or modification.

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