SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 66

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

11.4.4
11.4.5
11.4.6
66
66
SAM3X/A
SAM3X/A
Exceptions and interrupts
Data types
The Cortex Microcontroller Software Interface Standard
The Cortex-M3 processor supports interrupts and system exceptions. The processor and the
Nested Vectored Interrupt Controller (NVIC) prioritize and handle all exceptions. An exception
changes the normal flow of software control. The processor uses handler mode to handle all
exceptions except for reset. See
82
The NVIC registers control interrupt handling. See
page 153
The processor:
For a Cortex-M3 microcontroller system, the Cortex Microcontroller Software Interface Standard
(CMSIS) defines:
The CMSIS includes address definitions and data structures for the core peripherals in the Cor-
tex-M3 processor. It also includes optional interfaces for middleware components comprising a
TCP/IP stack and a Flash file system.
CMSIS simplifies software development by enabling the reuse of template code and the combi-
nation of CMSIS-compliant software components from various middleware vendors. Software
vendors can expand the CMSIS to include their peripheral definitions and access functions for
those peripherals.
This document includes the register names defined by the CMSIS, and gives short descriptions
of the CMSIS functions that address the processor core and the core peripherals.
from the architectural short names that might be used in other documents.
This document uses the register short names defined by the CMSIS. In a few cases these differ
• supports the following data types:
• supports 64-bit data transfer instructions.
• manages all data memory accesses as little-endian. Instruction memory and Private
• a common way to:
• the names of:
• a device-independent interface for RTOS kernels, including a debug channel.
for more information.
Peripheral Bus (PPB) accesses are always little-endian. See
attributes” on page 68
– 32-bit words
– 16-bit halfwords
– 8-bit bytes
– access peripheral registers
– define exception vectors
– the registers of the core peripherals
– the core exception vectors
for more information.
for more information.
“Exception entry” on page 81
“Nested Vectored Interrupt Controller” on
and
“Memory regions, types and
“Exception return” on page
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12