PM0223 datasheet(82/110 Pages) STMICROELECTRONICS

82 / 110 page

STM32L0 Core Peripherals

PM0223

82/110

DocID025763 Rev 1

4.2

Nested Vectored Interrupt Controller

This section describes the Nested Vectored Interrupt Controller (NVIC) and the registers it

uses. The NVIC supports:

•

32 interrupts.

•

A programmable priority level of 0-192 in steps of 64 for each interrupt. A higher level

corresponds to a lower priority, so level 0 is the highest interrupt priority.

•

Level and pulse detection of interrupt signals.

•

Interrupt tail-chaining.

•

An external Non-Maskable Interrupt (NMI).

The processor automatically stacks its state on exception entry and unstacks this state on

exception exit, with no instruction overhead. This provides low latency exception handling.

The hardware implementation of the NVIC registers is

4.2.1

Accessing the STM32L0 Cortex-M0+ NVIC registers using CMSIS

CMSIS functions enable software portability between different Cortex-M profile processors.

To access the NVIC registers when using CMSIS, use the following functions:

Table 26. NVIC register summary

Address

Name

Type Reset value Description

0xE000E100

NVIC_ISER

0x00000000

Interrupt Set-enable Register

on page 83.

0xE000E180

NVIC_ICER

0x00000000

Interrupt Clear-enable Register

on page 83.

0xE000E200

NVIC_ISPR

0x00000000

Interrupt Set-pending Register

on page 84.

0xE000E280

NVIC_ICPR

0x00000000

Interrupt Clear-pending

0xE000E400-0xE000E4EF

NVIC_IPR0-7 RW

0x00000000

Interrupt Priority Registers on

page 85.

Table 27. CMSIS access NVIC functions

CMSIS function

Description

void NVIC_EnableIRQ(IRQn_Type IRQn)

(1)

Enables an interrupt or exception.

void NVIC_DisableIRQ(IRQn_Type IRQn)

(1)

Disables an interrupt or exception.

void NVIC_SetPendingIRQ(IRQn_Type IRQn)

(1)

Sets the pending status of interrupt or exception to

void NVIC_ClearPendingIRQ(IRQn_Type IRQn)

(1)

Clears the pending status of interrupt or exception

to 0.

uint32_t NVIC_GetPendingIRQ(IRQn_Type IRQn)

(1)

Reads the pending status of interrupt or exception.

This function returns non-zero value if the pending

status is set to 1.

PM0223 датащи(PDF) 82 Page - STMicroelectronics

PM0223 датащи(HTML) 82 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL