AT91SAM7S128C-AU Atmel, AT91SAM7S128C-AU Datasheet - Page 147

• Manufacturer Part Number: AT91SAM7S128C-AU
• Description: IC ARM7 MCU 32BIT 128K 64LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7S128C-AU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 55MHz
• Connectivity: I²C, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• For Use With: AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7S-EK - KIT EVAL FOR ARM AT91SAM7S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Other names: AT91SAM7S128-AU-001; AT91SAM7S128AU001; AT91SAM7S128AU001

21.5.1
21.5.2
6175K–ATARM–30-Aug-10
DBGU Serial Port
Xmodem Protocol
Communication is performed through the DBGU serial port initialized to 115200 Baud, 8, n, 1.
The Send and Receive File commands use the Xmodem protocol to communicate. Any termi-
nal 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 to work.
The Xmodem protocol supported is the 128-byte length block. This protocol uses a two-char-
acter CRC-16 to guarantee detection of a maximum bit error.
Xmodem protocol with CRC is accurate provided both sender and receiver report successful
transmission. Each block of the transfer looks like:
<SOH><blk #><255-blk #><--128 data bytes--><checksum> in which:
Figure 21-4
Figure 21-4. Xmodem Transfer Example
– <SOH> = 01 hex
– <blk #> = binary number, starts at 01, increments by 1, and wraps 0FFH to 00H
– <255-blk #> = 1’s complement of the blk#.
– <checksum> = 2 bytes CRC16
(not to 01)
shows a transmission using this protocol.
Host
AT91SAM7S Series Preliminary
SOH 02 FD Data[128] CRC CRC
SOH 03 FC Data[100] CRC CRC
SOH 01 FE Data[128] CRC CRC
ACK
EOT
ACK
ACK
ACK
C
Device
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