at91cap7e ATMEL Corporation, at91cap7e Datasheet - Page 207

• Manufacturer Part Number: at91cap7e
• Description: Customizable Microcontroller
• Manufacturer: ATMEL Corporation

24. Advanced Power Management Controller
24.1
24.1.1
24.1.2
Figure 24-1. Typical Slow Clock Crystal Oscillator Connection
24.1.3
24.1.4
8549A–CAP–10/08
Clock Generator
Description
Slow Clock Crystal Oscillator
Slow Clock RC Oscillator
Main Oscillator
The Clock Generator is made up of
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
CKGR_.
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
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.
Figure 24-2
• 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
24-1.
shows the Main Oscillator block diagram.
Section
XIN32
24.2.10. However, the Clock Generator registers are named
32,768 Hz
Crystal
2
PLL, a Main Oscillator, as well as an RC Oscillator and a
XOUT32
G
AT91CAP7E
207