PM0215 datasheet(23/91 Pages) STMICROELECTRONICS

23 / 91 page

PM0215

The STM32 Cortex-M0 processor

Doc ID 022979 Rev 1

23/91

For an asynchronous exception other than reset, the processor can execute another

instruction between when the exception is triggered and when the processor enters the

exception handler.

Software can disable the exceptions that Table 12 on page 23 shows as having configurable

priority, see:Interrupt clear-enable register (ICER) on page 71.

For more information about hard faults, see Section 2.4: Fault handling on page 28.

2.3.3

Exception handlers

The processor handles exceptions using:

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 12.

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

Synchronous

4-10

Reserved

-5

SVCall

Configurable(3) 0x0000002C

Synchronous

12-13

Reserved

-2

PendSV

Configurable(3) 0x00000038

Asynchronous

-1

SysTick

Configurable(3) 0x0000003C

Asynchronous

16 - 47

0 - 31

Interrupt (IRQ)

Configurable(3)

0x00000040 and

above (4)

Asynchronous

To simplify the software layer, the CMSIS only uses IRQ numbers and therefore uses negative values for exceptions other

than interrupts. The IPSR returns the Exception number, see Interrupt program status register on page 14.

See Vector table on page 24 for more information.

See Interrupt priority register (IPR0-IPR7) on page 73.

Increasing in steps of 4.

Interrupt Service

Routines (ISRs)

Interrupts IRQ0 to IRQ31 are the exceptions handled by ISRs.

Fault handlers

Hard fault is the only fault exception handled by the fault handlers.

System handlers

NMI, PendSV, SVCall SysTick, and Hard fault exceptions are all

system exceptions that are handled by system handlers.

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