at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 97

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

13.3
6249D–ATARM–20-Dec-07
Device Initialization
Initialization follows the steps described below:
Table 13-1
Table 13-1.
3.0
4.433619
1. Stack setup for ARM supervisor mode
2. External Clock Detection
3. Switch Master Clock on Main Oscillator
4. C variable initialization
5. Main oscillator frequency detection
6. PLL setup: PLLB is initialized to generate a 48 MHz clock necessary to use the USB
7. Initialization of the DBGU serial port (115200 bauds, 8, N, 1)
8. Enable the User Reset
9. Jump to SD Card Boot sequence. If SD Card Boot succeeds, perform a remap and
10. Jump to NANDFlash Boot sequence. If NANDFlash Boot succeeds, perform a remap
11. Jump to DataFlash Boot sequence through NPCS0. If DataFlash Boot succeeds, per-
12. Activation of the Instruction Cache
13. Jump to SAM-BA Boot sequence
14. Disable the WatchDog
15. Initialization of the USB Device Port
6.0
7.3728
11.05920
14.31818
18.432
Device. A register located in the Power Management Controller (PMC) determines the
frequency of the main oscillator and thus the correct factor for the PLLB.
jump to 0x0.
and jump to 0x0.
form a remap and jump to 0x0.
defines the crystals supported by the Boot Program.
Crystals Supported by Software Auto-detection (MHz)
3.2768
6.144
7.864320
12.0
4.608
14.7456
20.0
3.6864
16.0
4.9152
6.4
8.0
12.288
AT91SAM9263 Preliminary
3.84
13
16.367667
5.0
6.5536
9.8304
4.0
5.24288
7.159090
10.0
13.56
17.734470
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