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AT697F bảng dữ liệu(PDF) 66 Page - ATMEL Corporation

tên linh kiện AT697F
Giải thích chi tiết về linh kiện  Rad-Hard 32 bit SPARC V8 Processor
PDF  155 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT697F bảng dữ liệu(HTML) 66 Page - ATMEL Corporation

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7703C–AERO–6/09
AT697F ADVANCE INFORMATION
If not programmed by software, the baud rate will be automatically be discovered. This is done
by searching for the shortest period between two falling edges of the received data (correspond-
ing to two bit periods). When three identical two-bit periods has been found, the corresponding
scaler reload value is latched into the reload register, and the DSUUC
BL bit is set . If the
DSUUC BL is reset by software, the baud rate discovery process is restarted. The baud-rate
discovey is also restarted when a ‘break’ is received by the receiver, allowing to change to
baudrate from the external transmitter. For proper baudrate detection, the value 0x55 should be
transmitted to the receiver after reset or after sending break.
The best scaler value for manually programming the baudrate can be calculated as follows:
scaler =
sdclk frequency x 10
baudrate x 8
5
10
Booting from DSU
By asserting DSUEN and DSUBRE at reset time, the processor will directly enter debug mode
without executing any instructions. The system can then be initialised from the communication
link, and applications can be downloaded and debugged. Additionally, external (flash) PROMs
for standalone booting can be re-programmed.



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