SAM9G20 Atmel Corporation, SAM9G20 Datasheet - Page 179

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SAM9G20

Manufacturer Part Number
SAM9G20
Description
Manufacturer
Atmel Corporation
Datasheets

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
21.6.1
Figure 21-5. PMC Startup
11053B–ATARM–22-Sep-11
External Main Cock
Main Supply
POR output
12 MHz RC
System starts on 32 kHz RC
RCEN = 1
OSC32EN = 0
OSCSEL = 0
MOSCRCEN = 1
MOSCXTEN = 0
MOSCSEL = 0
PMC_MCKR = 1
Fast wake-up
12 MHz RC Startup Time
Figure 21-4. Main Clock Selection
MOSCRCEN, MOSCXTEN, MOSCSEL and MOSCXTBY bits are located in the PMC Clock
Generator Main Oscillator Register (CKGR_MOR).
After a VDDBU power on reset, the default configuration is MOSCRCEN = 1, MOSCXTEN = 0
and MOSCSEL = 0, the 12 MHz RC oscillator is started as Main clock.
To speed up the wake-up phase, the system boots on 12 MHz RC (Main Clock). This allows the
user to perform system configuration (PLL, DDR2, etc.) at 12 MHz instead of 32 kHz during
12 MHz oscillator start-up.
Wait MOSCRCS = 1
System switches on Main Clock
to speed-up the boot
System is running at 12 MHz
External oscillator
is started for better accuracy
MOSCXTEN = 1
MOSCSEL = 0
XOUT
XIN
Crystal Startup Time
12M RC OSC
Main Clock
Oscillator
On Chip
Wait MOSCXTS = 1
User switches on external oscillator
MOSCSEL=1
Wait while MOSCSELS =1
System is runnning on 12 MHz Crystal
PLL can be used
MOSCRCEN
Main Clock
MOSCSEL
MOSCXTEN
MOSCXTBY
SAM9G35
179

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