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AT91SAM9G20 Datasheet(PDF) 76 Page - ATMEL Corporation

Part # AT91SAM9G20
Description  AT91 ARM Thumb Microcontrollers
PDF  832 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT91SAM9G20 Datasheet(HTML) 76 Page - ATMEL Corporation

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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.
5.
Initialization of the DBGU serial port (115200 bauds, 8, N, 1)
6.
Jump to Serial Flash Boot sequence through NPCS0. If Serial Flash Boot succeeds,
perform a remap and jump to 0x0.
7.
Jump to DataFlash Boot sequence through NPCS0. If DataFlash Boot succeeds, per-
form a remap and jump to 0x0.
8.
Jump to Serial Flash Boot sequence through NPCS1. If Serial Flash Boot succeeds,
perform a remap and jump to 0x0.
9.
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
50



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