SAM9XE512 Atmel Corporation, SAM9XE512 Datasheet - Page 316

• Manufacturer Part Number: SAM9XE512
• Manufacturer: Atmel Corporation

Specifications of SAM9XE512

• Flash (kbytes): 512 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 180 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): 2
• Uart: 6
• 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): 312
• 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): 1.65 to 1.95
• Fpu: No
• Mpu / Mmu: No / Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

27.4
27.5
27.6
27.6.1
316
Slow Clock RC Oscillator
Slow Clock Selection
Main Oscillator
AT91SAM9XE128/256/512 Preliminary
Main Oscillator Connections
Figure 27-2. Typical Slow Clock Crystal Oscillator Connection
The user has to take into account the possible drifts of the RC Oscillator. More details are given
in the section “DC Characteristics” of the product datasheet.
The AT91SAM9XE128/256/512 slow clock can be generated either by an external 32,768 Hz
crystal or the on-chip RC oscillator.
The startup counter delay for the slow clock oscillator depends on the OSCSEL signal. The
32,768 Hz startup delay is 1200 ms whereas it is 200 µs for the internal RC oscillator. The pin
OSCSEL must be tied either to GNDBU or VDDBU for correct operation of the device.
Refer to the Slow Clock Selection table in the Electrical Characteristics section of the product
datasheet for the states of the OSCSEL signal.
Figure 27-3
Figure 27-3. Main Oscillator Block Diagram
The Clock Generator integrates a Main Oscillator that is designed for a
crystal. The typical crystal connection is illustrated in
shows the Main Oscillator block diagram.
Slow Clock
XOUT
SLCK
XIN
XIN32
32,768 Hz
Crystal
Main Clock
Frequency
OSCOUNT
Oscillator
MOSCEN
Oscillator
Counter
Counter
Main
Main
XOUT32
Figure
GNDBU
27-4. The 1 k
Main Clock
MAINCK
MAINRDY
MOSCS
MAINF
3 to 20
6254C–ATARM–22-Jan-10
Ω
MHz fundamental
resistor is only