Datasheet

188
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
 System Control Block (SCB)
The System Control Block (SCB) is the programmers model interface to the processor. It provides system
implementation information and system control, including configuration, control, and reporting of system
exceptions. See Section 12.9 ”System Control Block (SCB)”
 System Timer (SysTick)
The System Timer, SysTick, is a 24-bit count-down timer. Use this as a Real Time Operating System (RTOS) tick
timer or as a simple counter. See Section 12.10 ”System Timer (SysTick)”
 Memory Protection Unit (MPU)
The Memory Protection Unit (MPU) improves system reliability by defining the memory attributes for different
memory regions. It provides up to eight different regions, and an optional predefined background region. See
Section 12.11 ”Memory Protection Unit (MPU)”
12.7.2
Address Map
The address map of the Private peripheral bus (PPB) is:
In register descriptions:
 The required privilege gives the privilege level required to access the register, as follows:
 Privileged: Only privileged software can access the register.
 Unprivileged: Both unprivileged and privileged software can access the register.
Table 12-28. Core Peripheral Register Regions
Address Core Peripheral
0xE000E008–0xE000E00F System Control Block
0xE000E010–0xE000E01F System Timer
0xE000E100–0xE000E4EF Nested Vectored Interrupt Controller
0xE000ED00–0xE000ED3F System control block
0xE000ED90–0xE000EDB8 Memory Protection Unit
0xE000EF00–0xE000EF03 Nested Vectored Interrupt Controller