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SH7285/SH7286 USB Function Module

USB to Serial Conversion Application Note

REJ05B1152-0100/Rev.1.00 May 2008 Page 3 of 35

2. Applications

This sample program uses the USB function module to execute the control IN, control OUT, bulk IN, and bulk OUT

transfers. The sample program also converts USB to serial signals and vice versa.

2.1 Features

The USB function module has an embedded USB 1.1 compliant USB Device Controller (UDC) to automatically

process USB protocols. The function module has four mounted endpoints for each transfer mode, and transfers data in

the control transfer, bulk OUT transfer, bulk IN transfer, and interrupt transfer to the USB host.

The following lists the USB function module features available in the SH7285 and SH7286 MCUs:

• Embedded USB 1.1 compliant UDC

• USB protocol processed automatically

• USB standard request to endpoint 0 processed automatically (some requests need to be processed by the firmware)

• Data rate: Full-speed

• Interrupt request: Generates various interrupt signals required for USB communication

• Clocks: External clock (48 MHz)

Internal clock (enabled only when EXTAL 12 MHz is selected)

• Low Power Mode

When a USB cable is not connected, less power is consumed by stopping the UDC internal clock

•

Endpoint configuration

Table 2.1 Endpoint Configurations

Endpoint Name Transfer Mode

Maximum

Packet Size

FIFO Buffer

Capacity

DMA

Transfer

EP0s Setup 8 bytes 8 bytes N/A

EP0i Control IN 8 bytes 8 bytes N/A

Endpoint 0

EP0o Control OUT 8 bytes 8 bytes N/A

Endpoint 1 EP1 Bulk OUT 64 bytes 64 x 2 (128 bytes) Available

Endpoint 2 EP2 Bulk IN 64 bytes 64 x 2 (128 bytes) Available

Endpoint 3 EP3 Interrupt 8 bytes 8 bytes N/A

2.2 USB Communication via the USB Function Module

As an example of using the USB function module for USB communication, the sample program implements the USB

communication features listed in the table below.

Table 2.2 USB Communication Functions

USB Communication Features Description

Detect a connection to the USB host The port pulls up the D+ pin to detect a connection.

Control transfer

Decodes requests, processes the Data stage and Status stage of the

USB request transmitted from the USB host in the control transfer.

Bulk IN/OUT transfers Executes bulk IN/OUT transfers.

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