PM0056 datasheet(34/156 Pages) STMICROELECTRONICS

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The Cortex-M3 processor

PM0056

34/156

DocID15491 Rev 5

Bus fault

A bus fault is an exception that occurs because of a memory related

fault for an instruction or data memory transaction. This might be

from an error detected on a bus in the memory system.

Usage fault

A usage fault is an exception that occurs because of a fault related

to instruction execution. This includes:

•

An undefined instruction

•

An illegal unaligned access

•

Invalid state on instruction execution

•

An error on exception return.

The following can cause a usage fault when the core is configured to

report them:

•

An unaligned address on word and halfword memory access

•

Division by zero

SVCall

A supervisor call (SVC) is an exception that is triggered by the SVC

instruction. In an OS environment, applications can use SVC

instructions to access OS kernel functions and device drivers.

PendSV

PendSV is an interrupt-driven request for system-level service. In an

OS environment, use PendSV for context switching when no other

exception is active.

SysTick

A SysTick exception is an exception the system timer generates

when it reaches zero. Software can also generate a SysTick

exception. In an OS environment, the processor can use this

exception as system tick.

Interrupt (IRQ)

A interrupt, or IRQ, is an exception signalled by a peripheral, or

generated by a software request. All interrupts are asynchronous to

instruction execution. In the system, peripherals use interrupts to

communicate with the processor.

Table 16. Properties of the different exception types

Exception

number(1)

IRQ

number(1)

Exception

type

Priority

Vector address

or offset(2)

Activation

Reset

-3, the highest

0x00000004

Asynchronous

-14

NMI

-2

0x00000008

Asynchronous

-13

Hard fault

-1

0x0000000C

-12

Memory

management fault

Configurable(3) 0x00000010

Synchronous

-11

Bus fault

Configurable(3) 0x00000014

Synchronous when precise,

asynchronous when imprecise

-10

Usage fault

Configurable(3) 0x00000018

Synchronous

7-10

Reserved

-5

SVCall

Configurable(3) 0x0000002C

Synchronous

12-13

Reserved

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