SAM9G10 Atmel Corporation, SAM9G10 Datasheet - Page 169

• Manufacturer Part Number: SAM9G10
• Manufacturer: Atmel Corporation

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

20. Slow Clock Controller (SCKC)
20.1
20.2
20.3
20.3.1
11053B–ATARM–22-Sep-11
11053B–ATARM–22-Sep-11
Description
Embedded Characteristics
Block Diagram
Switch from Internal 32 kHz RC Oscillator to 32,768 Hz Crystal Oscillator
The System Controller embeds a Slow Clock Controller.
The slow clock can be generated either by an external 32,768 Hz crystal oscillator or by the on-
chip 32 kHz RC oscillator. The 32,768 Hz crystal oscillator can be bypassed by setting the bit
OSC32BYP to accept an external slow clock on XIN32.
The internal 32 kHz RC oscillator and the 32,768 Hz oscillator can be enabled by setting to 1,
respectively, RCEN bit and OSC32EN bit in the System Controller user interface. The OSCSEL
command selects the slow clock source.
Figure 20-1. Block Diagram
RCEN, OSC32EN, OSCSEL and OSC32BYP bits are located in the Slow Clock Control Register
(SCKCR) located at address 0xFFFFFE50 in the backed up part of the System Controller and so
are preserved while VDDBU is present.
After a VDDBU power on reset, the default configuration is RCEN = 1, OSC32EN = 0 and
OSCSEL = 0, allowing the system to start on the internal 32 kHz RC oscillator.
The programmer controls the slow clock switching by software and so must take precautions
during the switching phase.
To switch from the internal 32 kHz RC oscillator to the 32,768 Hz crystal oscillator, the program-
mer must execute the following sequence:
• 32 kHz RC Oscillator or 32,768 Hz Crystal Oscillator Selector
• VDDBU Powered
• Switch the master clock to a source different from slow clock (PLL or Main Oscillator) through
• Enable the 32,768 Hz oscillator by setting the bit OSC32EN to 1.
the Power Management Controller.
XOUT32
XIN32
Slow Clock
Oscillator
On Chip
RC OSC
Slow Clock
SLCK
RCEN
OSCSEL
OSC32EN
OSC32BYP
SAM9G35
SAM9G35
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