SAM9G45 Atmel Corporation, SAM9G45 Datasheet - Page 293

• Manufacturer Part Number: SAM9G45
• Manufacturer: Atmel Corporation

Specifications of SAM9G45

• Flash (kbytes): 0 Kbytes
• Pin Count: 324
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 160
• Ext Interrupts: 160
• Usb Transceiver: 3
• Usb Speed: Hi-Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 2
• Uart: 5
• Lin: 4
• Ssc: 2
• Ethernet: 1
• Sd / Emmc: 2
• Graphic Lcd: Yes
• Video Decoder: No
• Camera Interface: Yes
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 440
• Resistive Touch Screen: Yes
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 64
• Self Program Memory: NO
• External Bus Interface: 2
• Dram Memory: DDR2/LPDDR, SDRAM/LPSDR
• 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
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

24.6
24.6.1
24.6.2
24.6.3
6438G–ATARM–19-Apr-11
Main Oscillator
Main Oscillator Connections
Main Oscillator Startup Time
Main Oscillator Control
The Main Oscillator is designed for a 12 MHz fundamental crystal. The 12 MHz is an input of the
PLLA and the UPLL used to generate the 480 MHz USB High Speed Clock (UPLLCK).
Figure 24-4
Figure 24-4. Main Oscillator Block Diagram
The typical crystal connection is illustrated in
characteristics of the Main Oscillator, see the section “DC Characteristics” of the product
datasheet.
Figure 24-5. Typical Crystal Connection
The startup time of the 12 MHz Main Oscillator is given in the section “DC Characteristics” of the
product datasheet.
To minimize the power required to start up the system, the main oscillator is disabled after reset
and slow clock is selected.
The software enables or disables the main oscillator so as to reduce power consumption by
clearing the MOSCEN bit in the Main Oscillator Register (CKGR_MOR).
When disabling the main oscillator by clearing the MOSCEN bit in CKGR_MOR, the MOSCS bit
in PMC_SR is automatically cleared, indicating the main clock is off.
When enabling the main oscillator, the user must initiate the main oscillator counter with a value
corresponding to the startup time of the oscillator. This startup time depends on the crystal fre-
quency connected to the main oscillator.
shows the Main Oscillator block diagram.
XOUT
XIN
XIN
12M Main
PLLA and
Oscillator
Divider
UPLL
Figure
XOUT
24-5. For further details on the electrical
GNDOSC
Main Clock
MAINCK
UPLLCK
PLLA Clock
PLLACK
SAM9G45
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