PIC16C63A-04I/SO【PDF 55/184 页】IC MCU OTP 4KX14 PWM 28SOIC

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148

SAM7S Series [DATASHEET]

6175M–ATARM–26-Oct-12

The device uses the USB communication device class (CDC) drivers to take advantage of the installed PC RS-232

software to talk over the USB. The CDC class is implemented in all releases of Windows

, from Windows98SE to

WindowsXP. The CDC document, available at www.usb.org, describes a way to implement devices such as ISDN

modems and virtual COM ports.

The Vendor ID is Atmel’s vendor ID 0x03EB. The product ID is 0x6124. These references are used by the host

operating system to mount the correct driver. On Windows systems, the INF files contain the correspondence

between vendor ID and product ID.

21.5.3.1

Enumeration Process

The USB protocol is a master/slave protocol. This is the host that starts the enumeration sending requests to the

device through the control endpoint. The device handles standard requests as defined in the USB Specification.

The device also handles some class requests defined in the CDC class.

Unhandled requests are STALLed.

21.5.3.2

Communication Endpoints

There are two communication endpoints and endpoint 0 is used for the enumeration process. Endpoint 1 is a 64-

byte Bulk OUT endpoint and endpoint 2 is a 64-byte Bulk IN endpoint. SAM-BA Boot commands are sent by the

host through the endpoint 1. If required, the message is split by the host into several data payloads by the host

driver.

If the command requires a response, the host can send IN transactions to pick up the response.

Table 21-2.

Handled Standard Requests

Request

Definition

GET_DESCRIPTOR

Returns the current device configuration value.

SET_ADDRESS

Sets the device address for all future device access.

SET_CONFIGURATION

Sets the device configuration.

GET_CONFIGURATION

Returns the current device configuration value.

GET_STATUS

Returns status for the specified recipient.

SET_FEATURE

Used to set or enable a specific feature.

CLEAR_FEATURE

Used to clear or disable a specific feature.

Table 21-3.

Handled Class Requests

Request

Definition

SET_LINE_CODING

Configures DTE rate, stop bits, parity and number of

character bits.

GET_LINE_CODING

Requests current DTE rate, stop bits, parity and number

of character bits.

SET_CONTROL_LINE_STATE

RS-232 signal used to tell the DCE device the DTE

device is now present.

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