AT91SAM7S512-MU-999 Atmel, AT91SAM7S512-MU-999 Datasheet - Page 147
AT91SAM7S512-MU-999
Manufacturer Part Number
AT91SAM7S512-MU-999
Description
IC MCU ARM7 512KB FLASH 64-VQFN
Manufacturer
Atmel
Series
AT91SAMr
Specifications of AT91SAM7S512-MU-999
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
512KB (512K x 8)
Program Memory Type
FLASH
Ram Size
64K 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-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
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
-
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- Download datasheet (11Mb)
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
147
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