PM0214 datasheet(211/245 Pages) STMICROELECTRONICS

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DocID022708 Rev 4

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PM0214

Core peripherals

244

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.

Bit 27

PENDSVCLR: PendSV clear-pending bit. This bit is write-only. On a read, value is unknown.

0: No effect

1: Removes the pending state from the PendSV exception.

Bit 26

PENDSTSET: SysTick exception set-pending bit.

Write:

0: No effect

1: Change SysTick exception state to pending

Read:

0: SysTick exception is not pending

1: SysTick exception is pending

Bit 25

PENDSTCLR: SysTick exception clear-pending bit. Write-only. On a read, value is unknown.

0: No effect

1: Removes the pending state from the SysTick exception.

Bit 24

Reserved, must be kept cleared.

Bit 23

This bit is reserved for Debug use and reads-as-zero when the processor is not in Debug.

Bit 22

ISRPENDING: Interrupt pending flag, excluding NMI and Faults.

0: Interrupt not pending

1: Interrupt pending

Bits 21:19

Reserved, must be kept cleared.

Bits 18:12

VECTPENDING: Pending vector. Indicates the exception number of the highest priority

pending enabled exception.

0: No pending exceptions

Other values: The exception number of the highest priority pending enabled exception.

The value indicated by this field includes the effect of the BASEPRI and FAULTMASK

registers, but not any effect of the PRIMASK register.

Bit 11

RETTOBASE: Return to base level. Indicates whether there are preempted active

exceptions:

0: There are preempted active exceptions to execute

1: There are no active exceptions, or the currently-executing exception is the only active

exception.

Bits 10:9

Reserved

Bits 8:0

VECTACTIVE Active vector. Contains the active exception number:

0: Thread mode

Other values: The exception number(1) of the currently active exception.

Note: Subtract 16 from this value to obtain CMSIS IRQ number required to index into the

Interrupt Clear-Enable, Set-Enable, Clear-Pending, Set-Pending, or Priority Registers,

see Table 6 on page 21.

1. This is the same value as IPSR bits[8:0], see Interrupt program status register on page 21.

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