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| 型號(hào)： | MC80C52TXXX-16SC |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| 文件頁(yè)數(shù)： | 74/77頁(yè) |
| 文件大?。?/td> | 7480K |
| 代理商： | MC80C52TXXX-16SC |
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76
SAMA5D3 Series [DATASHEET]
11121D–ATARM–03-Apr-14
Figure 12-11 shows a transmission using this protocol.
Figure 12-11.Xmodem Transfer Example
12.5.3 USB Device Port
12.5.3.1 Supported External Crystal / External Clocks
The SAM-BA Monitor supports a frequency of 12, 16, 24 or 48 MHz to allow USB communication for both external crystal
and external clock.
12.5.3.2 USB Class
The device uses the USB Communication Device Class (CDC) drivers to take advantage of the installed PC Serial
Communication software to talk over the USB. The CDC class is implemented in all releases of Windows
, from
Windows 98SE to Windows 7. The CDC document, available at www.usb.org, describes how to implement devices
such as ISDN modems and virtual COM ports.
The Vendor ID is the 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, INF files contain the correspondence between
vendor ID and product ID.
12.5.3.3 Enumeration Process
The USB protocol is a master/slave protocol. The host starts the enumeration, sending requests to the device through
the control endpoint. The device handles standard requests as defined in the USB Specification.
Host
Device
SOH 01 FE Data[128] CRC CRC
C
ACK
SOH 02 FD Data[128] CRC CRC
ACK
SOH 03 FC Data[100] CRC CRC
ACK
EOT
ACK
Table 12-5. 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
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