Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
60
12.4.1.17 Exceptions and Interrupts
The Cortex-M4 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 the Handler mode to handle all exceptions except for reset. See
Interrupt Controller (NVIC) prioritize and handle all exceptions. An exception changes the normal flow of software
control. The processor uses the Handler mode to handle all exceptions except for reset. See
and
for more information.
The NVIC registers control interrupt handling. See
for more
information.
12.4.1.18 Data Types
The processor supports the following data types:
32-bit words
16-bit halfwords
8-bit bytes
The processor manages all data memory accesses as little-endian. Instruction memory and Private
Peripheral Bus (PPB) accesses are always little-endian. See
Peripheral Bus (PPB) accesses are always little-endian. See
for
more information.
12.4.1.19 Cortex Microcontroller Software Interface Standard (CMSIS)
For a Cortex-M4 microcontroller system, the Cortex Microcontroller Software Interface Standard (CMSIS) defines:
A common way to:
̶
Access peripheral registers
̶
Define exception vectors
The names of:
̶
The registers of the core peripherals
̶
The core exception vectors
A device-independent interface for RTOS kernels, including a debug channel.
The CMSIS includes address definitions and data structures for the core peripherals in the Cortex-M4 processor.
The CMSIS simplifies the software development by enabling the reuse of template code and the combination 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.
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.
functions that address the processor core and the core peripherals.
Note:
This document uses the register short names defined by the CMSIS. In a few cases, these differ from the architectural
short names that might be used in other documents.
short names that might be used in other documents.
The following sections give more information about the CMSIS:
.