SAM9G10 Atmel Corporation, SAM9G10 Datasheet - Page 180

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SAM9G10

Manufacturer Part Number
SAM9G10
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of SAM9G10

Flash (kbytes)
0 Kbytes
Pin Count
217
Max. Operating Frequency
266 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
4
Ssc
3
Sd / Emmc
1
Graphic Lcd
Yes
Video Decoder
No
Camera Interface
No
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
16
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)
1.08 to 1.32
Fpu
No
Mpu / Mmu
No/Yes
Timers
3
Output Compare Channels
3
Input Capture Channels
3
32khz Rtc
Yes
Calibrated Rc Oscillator
No
21.6.2
21.6.3
21.6.4
21.6.5
21.6.6
180
SAM9G35
Switch from Internal 12 MHz RC Oscillator to the 12 MHz Crystal
Bypass the 12 MHz Oscillator
Switch from the 12 MHz Crystal to Internal 12 MHz RC Oscillator
12 MHz Fast RC Oscillator
3 to 20 MHz Crystal Oscillator
For USB operations an external 12 MHz crystal is required for better accuracy.
The programmer controls the main clock switching by software and so must take precautions
during the switching phase.
To switch from internal 12 MHz RC oscillator to the 12 MHz crystal, the programmer must exe-
cute the following sequence:
Following step must be added to bypass the 12 MHz Oscillator.
The same procedure must be followed to switch from a 12 MHz crystal to the internal 12 MHz
RC oscillator.
After reset, the 12 MHz Fast RC Oscillator is enabled and it is selected as the source of MCK.
MCK is the default clock selected to start up the system.
Please refer to the “DC Characteristics” section of the product datasheet.
The software can disable or enable the 12 MHz Fast RC Oscillator with the MOSCRCEN bit in
the Clock Generator Main Oscillator Register (CKGR_MOR).
When disabling the Main Clock by clearing the MOSCRCEN bit in CKGR_MOR, the MOSCRCS
bit in the Power Management Controller Status Register (PMC_SR) is automatically cleared,
indicating the Main Clock is off.
Setting the MOSCRCS bit in the Power Management Controller Interrupt Enable Register
(PMC_IER) can trigger an interrupt to the processor.
After reset, the 3 to 20 MHz Crystal Oscillator is disabled and it is not selected as the source of
MAINCK.
• Enable the 12 MHz oscillator by setting the bit MOSCXTEN to 1.
• Wait that 12 MHz oscillator status MAINRDY is 1.
• Switch from internal 12 MHz RC oscillator to the 12 MHz oscillator by setting the bit
• If not the bit MOSCSEL is set to 0 by the PMC.
• Disable the 12 MHz RC oscillator by setting the bit MOSCRCEN to 0.
• An external clock must be connected on XIN.
• Enable the bypass path MOSCXTBY bit set to 1.
• Disable the 12 MHz oscillator by setting the bit MOSCXTEN to 0.
• Enable the internal 12 MHz RC oscillator for low power by setting the bit MOSCRCEN to 1
• Wait internal 12 MHz RC Startup Time for clock stabilization (software loop).
• Switch from 12 MHz oscillator to internal 12 MHz RC oscillator by setting the bit MOSCSEL
• Disable the 12 MHz oscillator by setting the bit MOSCXTEN to 0.
MOSCSEL to 1.
to 0.
11053B–ATARM–22-Sep-11

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