AT91SAM9XE128_1 Datasheet, PDF (79/866 Pages) ATMEL Corporation – AT91 ARM Thumb Microcontrollers

AT91SAM9XE128/256/512 Preliminary
8. Initialization of the DBGU serial port (115200 bauds, 8, N, 1) only if OSCSEL = 1
9. Enable the user reset
10. Jump to SAM-BA Boot sequence
11. Disable the Watchdog
12. Initialization of the USB Device Port
Figure 13-2. Clocks and DBGU Configurations
Start
No
Internal RC Oscillator?
Yes
(OSCSEL = 0)
Scan Large Crystal Table
(Table 15.3 &15.4)
Scan Reduced Table
(Table 15.1 &15.2)
MCK = PLLB/2
UDPCK = PLLB/2
"ROMBoot>" displayed on DBGU
End
No (USB)
MCK = Mosc
UDPCK = PLLB/2
DBGU not configured
No
Autobaudrate ?
Yes (DBGU)
MCK = Mosc
UDPCK = PLLB/2
DBGU not configured
MCK = PLLB
UDPCK = xxxx
DBGU configured
End
End
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6254B–ATARM–29-Apr-09