SAM3U Datasheet, PDF (36/59 Pages) ATMEL Corporation – AT91SAM ARM-based Flash MCU

Figure 10-1. System Controller Block Diagram
VDDBU
VDDIN
FWUP
SHDN
NRSTB
Zero-Power
Power-on Reset
vr_standby
Supply
Controller
Software Controlled
Voltage Regulator
PIOA/B/C
Input / Output Buffers
VDDOUT
WKUP0 - WKUP15
VDDIO
PIOx
VDDANA
General Purpose
Backup Registers
SLCK
rtc_alarm
RTC
SLCK
rtt_alarm
RTT
bodbup_in
bodbup_on
Supply
Monitor
ADC (front-end)
ADVREF
ADx
VDDUTMI
USB
USBx
XIN32
XOUT32
osc32k_xtal_en
Xtal 32 kHz
Oscillator
XTALSEL
Slow Clock
SLCK
Embedded
32 kHz RC _{osc32k_rc_en}
Oscillator
vddcore_nreset
bodcore_on
bodcore_in
supc_interrupt
Backup Power Supply
vddcore_nreset
NRST
Reset
Controller
proc_nreset
periph_nreset
ice_nreset
Cortex-M3
FSTT0 - FSTT15(1)
XIN
XOUT
Embedded
12 / 8 / 4 MHz
RC
Oscillator
3 - 20 MHz
XTAL Oscillator
MAINCK
PLLA
SLCK
Main Clock
MAINCK
Power
Management
Controller
Master Clock
MCK
PLLACK
SLCK
Brownout
Detector
VDDCORE
Matrix
SRAM
Peripherals
Peripheral
Bridge
Flash
Watchdog
Timer
MAINCK
UPLL
UPLLCK
Core Power Supply
FSTT0 - FSTT15 are possible Fast Startup Sources, generated by WKUP0-WKUP15 Pins,
but are not physical pins.
36 SAM3U Series
6430ES–ATARM–22-Aug-11