at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 347

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

26. Clock Generator
26.1
26.2
Figure 26-1. Typical Slow Clock Crystal Oscillator Connection
26.3
6249D–ATARM–20-Dec-07
Description
Slow Clock Crystal Oscillator
Main Oscillator
The Clock Generator is made up of 2 PLLs, a Main Oscillator, and a 32,768 Hz low-power
Oscillator.
It provides the following clocks:
The Clock Generator User Interface is embedded within the Power Management Controller one
and is described in
The Clock Generator integrates a 32,768 Hz low-power oscillator. The XIN32 and XOUT32 pins
must be connected to a 32,768 Hz crystal. Two external capacitors must be wired as shown in
Figure
Figure 26-2
• SLCK, the Slow Clock, which is the only permanent clock within the system
• MAINCK is the output of the Main Oscillator
• PLLACK is the output of the Divider and PLL A block
• PLLBCK is the output of the Divider and PLL B block
26-1.
shows the Main Oscillator block diagram.
XIN32
Section
32,768 Hz
Crystal
27.9. However, the Clock Generator registers are named CKGR_.
XOUT32
AT91SAM9263 Preliminary
GNDPLL
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