AT91SAM7S256 ATMEL Corporation, AT91SAM7S256 Datasheet - Page 19

• Manufacturer Part Number: AT91SAM7S256
• Description: AT91 ARM THUMB-BASED MICROCONTROLLERS
• Manufacturer: ATMEL Corporation

Clock Generator
6117AS–ATARM–20-Oct-04
The Clock Generator embeds one low-power RC Oscillator, one Main Oscillator and
one PLL with the following characteristics:
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It provides SLCK, MAINCK and PLLCK.
Figure 7. Clock Generator Block Diagram
RC Oscillator ranges between 22 KHz and 42 KHz
Main Oscillator frequency ranges between 3 and 20 MHz
Main Oscillator can be bypassed
PLL output ranges between 80 and 200 MHz
AT91SAM7S256 Summary Preliminary
PLLRC
XOUT
XIN
Clock Generator
Management
Embedded
Status
Oscillator
Oscillator
PLL and
Controller
Divider
Main
Power
RC
Control
Slow Clock
SLCK
Main Clock
MAINCK
PLL Clock
PLLCK
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