PM0215 datasheet(78/91 Pages) STMICROELECTRONICS

78 / 91 page

Core peripherals

PM0215

78/91

Doc ID 022979 Rev 1

4.3.2

Interrupt control and state register (ICSR)

Address offset: 0x04

Reset value: 0x0000 0000

The ICSR:

●

Provides:

–

A set-pending bit for the Non-Maskable Interrupt (NMI) exception

–

Set-pending and clear-pending bits for the PendSV and SysTick exceptions

●

Indicates:

–

The exception number of the exception being processed

–

Whether there are preempted active exceptions

–

The exception number of the highest priority pending exception

–

Whether any interrupts are pending.

Caution:

When you write to the ICSR, the effect is unpredictable if you:

●

Write 1 to the PENDSVSET bit and write 1 to the PENDSVCLR bit

●

Write 1 to the PENDSTSET bit and write 1 to the PENDSTCLR bit.

NMIPE

NDSET

Reserved

PEND

SVSET

PEND

SVCLR

PEND

STSET

PENDS

TCLR

Reserved

ISRPE

NDING

Reserved

VECTPENDING[

5:4]

4321

VECTPENDING[3:0]

Reserved

VECTACTIVE[5:0]

rwrwrwrw

Bit 31 NMIPENDSET: NMI set-pending bit.

Write:

0: No effect

1: Change NMI exception state to pending.

Read:

0: NMI exception is not pending

1: NMI exception is pending

Because NMI is the highest-priority exception, normally the processor enter the NMI

exception handler as soon as it registers a write of 1 to this bit, and entering the handler clears

this bit to 0. A read of this bit by the NMI exception handler returns 1 only if the NMI signal is

reasserted while the processor is executing that handler.

Bits 30:29 Reserved

Bit 28 PENDSVSET: PendSV set-pending bit.

Write:

0: No effect

1: Change PendSV exception state to pending.

Read:

0: PendSV exception is not pending

1: PendSV exception is pending

Writing 1 to this bit is the only way to set the PendSV exception state to pending.

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