ATSAMA5D35A-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATSAMA5D35A-CU

SMART ARM-based MPU

Atmel Corporation 

11.5.2 DBGU Serial Port

Communication is performed through the DBGU serial port initialized to 115,200 Baud, 8 bits of data, no parity, 1

stop bit.

11.5.2.1 Supported External Crystal/External Clocks

The SAM-BA Monitor supports a frequency of 12, 16, 24 or 48 MHz to allow DBGU communication for both

external crystal and external clock.

11.5.2.2 Xmodem Protocol

The Send and Receive File commands use the Xmodem protocol to communicate. Any terminal performing this

protocol can be used to send the application file to the target. The size of the binary file to send depends on the

SRAM size embedded in the product. In all cases, the size of the binary file must be lower than the SRAM size

because the Xmodem protocol requires some SRAM memory in order to work.

The Xmodem protocol supported is the 128-byte length block. This protocol uses a two-character CRC16 to

guarantee detection of maximum bit errors.

Xmodem protocol with CRC is supported by successful transmission reports provided both by a sender and by

a receiver. Each transfer block is as follows:

<SOH><blk #><255-blk #><--128 data bytes--><checksum> in which:

̶ <SOH> = 01 hex

̶ <blk #> = binary number, starts at 01, increments by 1, and wraps 0FFH to 00H (not to 01)

̶ <255-blk #> = 1’s complement of the blk#.

̶ <checksum> = 2 bytes CRC16

Figure 11-11 shows a transmission using this protocol.

Figure 11-11. Xmodem Transfer Example

Host

Device

C

SOH 01 FE Data[128] CRC CRC

ACK

SOH 02 FD Data[128] CRC CRC

ACK

SOH 03 FC Data[100] CRC CRC

ACK

EOT

ACK

SAMA5D3 Series [DATASHEET]

77

Atmel-11121F-ATARM-SAMA5D3-Series-Datasheet_02-Feb-16

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