at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 28

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

9.2
9.3
9.4
Figure 9-2.
28
Reset Controller
Shutdown Controller
Clock Generator
AT91SAM9263 Preliminary
Clock Generator Block Diagram
• Based on two Power-on-Reset cells
• Status of the last reset
• Controls the internal resets and the NRST pin output
• Shutdown and Wake-up logic
• Embeds the low-power 32768 Hz Slow Clock Oscillator
• Embeds the Main Oscillator
• Embeds 2 PLLs
– One on VDDBU and one on VDDCORE
– Either general reset (VDDBU rising), wake-up reset (VDDCORE rising), software
– Allows shaping a reset signal for the external devices
– Software programmable assertion of the SHDN pin (SHDN is push-pull)
– Deassertion programmable on a WKUP pin level change or on alarm
– Provides the permanent Slow Clock SLCK to the system
– Oscillator bypass feature
– Supports 3 to 20 MHz crystals
– Output 80 to 240 MHz clocks
– Integrates an input divider to increase output accuracy
– 1 MHz Minimum input frequency
reset, user reset or watchdog reset
XOUT32
PLLRCA
PLLRCB
XIN32
XOUT
XIN
Clock Generator
Management
Slow Clock
Controller
Oscillator
Oscillator
Status
PLL and
Divider A
PLL and
Divider B
Power
Main
Control
Slow Clock
SLCK
Main Clock
MAINCK
PLLA Clock
PLLACK
PLLB Clock
PLLBCK
6249D–ATARM–20-Dec-07