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V850E2/MN4 USB CDC (Communication Device Class) Driver

R01AN0010EJ0101 Rev.1.01 Page 16 of 117

Feb 01, 2012

4. Sample Driver Specifications

This section contains a detailed description of the features and operations of the USB communication device class

(CDC) sample driver for the V850E2/MN4 microcontroller. It also describes the specifications for the functions of the

sample driver.

4.1 Overview

4.1.1 Features

The sample driver has the following processing implemented:

(1)

Initialization

The initialization routine manipulates and sets up various registers to make the USB function controller ready for use.

The register settings are broadly divided into those for the V850E2/MN4’s CPU registers and those for the registers of

the USB function controller. For details, see section 4.2.1, CPU Initialization Processing, and section 4.2.2, USB

Function Controller Initialization Processing.

(2)

Endpoint Processing

The state of the endpoints for data transfer in the USB function controller is reported by the INTUSFA0I1 interrupt.

Broadly classified, there are two interrupts: the CPUDEC interrupt when a request to perform decoding is received in

the sample driver for a control data transfer endpoint (Endpoint0), and the BKO1DT interrupt that indicates that data

has been received normally for the bulk OUT data transfer (reception) endpoint (Endpoint2). The request response is

made in the Endpoint0 processing. For details, see section 4.2.3, USBF Interrupt Processing (INTUSFA0I1).

(3)

Sample Application

The sample application reads the data in the bulk OUT data transfer (reception) endpoint and writes that read data

without modification to the bulk IN data transfer (transmission) endpoint. For details, see section 5, Sample Application

Specifications.

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