SAM9G20 Atmel Corporation, SAM9G20 Datasheet - Page 75

• Manufacturer Part Number: SAM9G20
• Manufacturer: Atmel Corporation

Specifications of SAM9G20

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 96
• Ext Interrupts: 96
• Usb Transceiver: 3
• Usb Speed: Full Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 1
• Uart: 7
• Ssc: 1
• Ethernet: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: Yes
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 95
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 0.9 to 1.1
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

13.3
6384E–ATARM–05-Feb-10
Device Initialization
Initialization follows the steps described below:
Table 13-1.
Note:
Table 13-2.
Note:
Table 13-3.
Note:
Boot in DBGU
Boot on USB
Boot in DBGU
Boot on USB
3.0
4.433619
6.0
1. Stack setup for ARM supervisor mode
2. Main Oscillator Frequency Detection
3. C variable initialization
4. PLL setup: PLLB is initialized to generate a 48 MHz clock necessary to use the USB
7.3728
11.05920
14.7456
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.
– If internal RC Oscillator is used (OSCSEL = 0) and Main Oscillator is active,
– If internal RC Oscillator is used (OSCSEL = 0) and Main Oscillator is bypassed,
– If an external 32768 Hz Oscillator is used (OSCSEL = 1), defines the crystals
13-1
oscillator. also supported by the Boot Program.
Table 13-2
the main oscillator.
supported by the Boot Program.
Boot Program.
Any other crystal can be used but it prevents using the USB.
Any other crystal can be used but it prevents using the USB.
Booting either on USB or on DBGU is possible with any of these input frequencies.
defines the crystals supported by the Boot Program when using the internal RC
Crystals Supported by Software Auto-Detection (MHz)
Crystals Supported by Software Auto-Detection (MHz)
Crystals Supported by Software Auto-Detection (MHz)
defines the frequencies supported by the Boot Program when bypassing
3.0
Yes
Yes
3.0
Yes
Yes
3.2768
6.144
7.864320
12.0
16.0
4.608
8.0
Yes
Yes
8.0
Yes
Yes
3.6864
4.9152
6.4
8.0
12.288
17.734470
Table 13-3
20
Yes
Yes
defines the crystals supported by the
18.432
Yes
Yes
3.84
5.0
6.5536
9.8304
13.56
18.432
50
Yes
Yes
AT91SAM9G20
Other
Yes
No
4.0
5.24288
7.159090
10.0
14.31818
20.0
Other
Yes
No
TTable
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