at91sam7l128 ATMEL Corporation, at91sam7l128 Datasheet - Page 33

• Manufacturer Part Number: at91sam7l128
• Description: At91 Arm Thumb-based Microcontroller
• Manufacturer: ATMEL Corporation

9.5
6257AS–ATARM–28-Feb-08
Power Management Controller
Figure 9-2.
The Power Management Controller uses the clock generator outputs to provide:
The Master Clock (MCK) is programmable from a few hundred Hz to the maximum operating fre-
quency of the device.
The Processor Clock (PCK) switches off when entering processor idle mode, thus allowing
reduced power consumption while waiting for an interrupt.
The LCD Controller clock is SCLK.
• The Processor Clock PCK
• The Master Clock MCK
• All the peripheral clocks, independently controllable
• Three programmable clock outputs PCKx
Clock Generator Block Diagram
PLLRC
CLKIN
XOUT
XIN
Embedded
Xtal 32 kHz
Embedded
Management
2 MHz RC
Oscillator
32 kHz RC
Status
AT91SAM7L128/64 Preliminary
Oscillator
Oscillator
OSCSEL
Controller
SLCK
Power
Control
PLL and
Clock Generator
Divider
Slow Clock
SLCK
PLL Clock
PLLCK
MCK_SEL
Main Clock
MAINCK
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