AT91SAM9G20 datasheet(76/832 Pages) ATMEL

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6384D–ATARM–04-May-09

AT91SAM9G20 Preliminary

– If an external 32768 Hz Oscillator is used (OSCSEL = 1) and Main Oscillator is

bypassed. Table 13-4 defines the crystals supported by the Boot Program.

Note:

Booting either on USB or on DBGU is possible with any of these input frequencies.

Initialization of the DBGU serial port (115200 bauds, 8, N, 1)

Jump to Serial Flash Boot sequence through NPCS0. If Serial Flash Boot succeeds,

perform a remap and jump to 0x0.

Jump to DataFlash Boot sequence through NPCS0. If DataFlash Boot succeeds, per-

form a remap and jump to 0x0.

Jump to Serial Flash Boot sequence through NPCS1. If Serial Flash Boot succeeds,

perform a remap and jump to 0x0.

Jump to DataFlash Boot sequence through NPCS1. If DataFlash Boot succeeds, per-

form a remap and jump to 0x0.

10. Jump to NAND Flash Boot sequence. If NAND Flash Boot succeeds, perform a remap

and jump to 0x0.

11. Jump to SDCard Boot sequence. If SDCard Boot succeeds, perform a remap and jump

to 0x0.

12. Jump to EEPROM Boot sequence. If EEPROM Boot succeeds, perform a remap and

jump to 0x0.

13. Activation of the Instruction Cache

14. Jump to SAM-BA Boot sequence

15. Disable the WatchDog

16. Initialization of the USB Device Port

Table 13-4.

Input Frequencies Supported (OSCEL = 1)

3.0

3.2768

3.6864

3.84

4.0

4.433619

4.608

4.9152

5.0

5.24288

6.0

6.144

6.4

6.5536

7.159090

7.3728

7.864320

8.0

9.8304

10.0

11.05920

12.0

12.288

13.56

14.31818

14.7456

16.0

17.734470

18.432

20.0

24.0

24.576

25.0

28.224

32.0

33.0

40.0

48.0

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