Unimplemented bits are read as zero. Memory Management Interrupt [not on Cortex-M0 variants]. Value cannot be negative. For example, if the minimum number of 3 bits have been implemented, the read-back value is 0xE0. Sets the priority for the interrupt specified by IRQn. IRQn cannot be a negative number.

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Other processor variants may have fewer vectors. Refer to Programmers Model with TrustZone for more information. The default priority is 0 for every interrupt.

Peripheral drivers will be provided through example code or peripheral driver libraries, typically provided by the Lpcc vendor. Each interrupt handler is defined as a weak function to an dummy handler. By default, priority group setting is zero. What does the Project Wizard actually do?

Interrupts and Exceptions (NVIC)

The table below describes the core exception names and their availability in various Cortex-M cores. All device specific interrupts should have a default interrupt handler function that can be overwritten in user code.

Set a device specific interrupt to pending. Clears the interrupt target field in the non-secure NVIC when in secure state. The Vector Table defines the entry addresses of opc processor exceptions and the device specific interrupts. When the processor starts the interrupt handler the bit is set to 1 and cleared when the interrupt return is executed.


Set Interrupt Target State. This field lp the split of group priority from subpriority.


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Each register can be further devided into preempt priority level and subpriority level. IRQn must not be negative.

Parameters [in] IRQn Interrupt Number [in] priority Priority to set Remarks The number of priority levels is configurable and depends on the implementation of the chip designer.

This function reads the priority for the specified interrupt IRQn. HardFault and NMI have a fixed negative priority that is higher than any configurable exception or interrupt.

The file must be adapted by the silicon vendor to include interrupt vectors for all device-specific interrupt handlers. The vector table below shows the exception vectors of a Armv8-M Mainline processor. The priority specifies the interrupt priority value, whereby lower values indicate a higher priority. The user application may simply define an interrupt handler function by using the handler name as shown below.


At the beginning of the vector table, the initial stack value and the exception vectors of the processor are defined. Get the pending device specific interrupt. Sets the interrupt target field in the non-secure NVIC when in secure state. Clear Interrupt Target State. An interrupt can have the status pending though it is not active.

Support4CMSIS – ** Code Red Support Site **

For more details please see the following FAQs: Get Interrupt Target State. IRQn cannot be a negative number.

Refer to Using Interrupt Vector Remap for more information. When you choose to create a CMSIS-based project, the wizard will make a number of modifications to all build configurations of the project that it creates: Enable a device specific interrupt.

After making your CMSIS choices, the rest of the project wizard then allows you create startup files, select the build configurations to be created, and finally select the actual target MCU.