UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 19 December 2013 73 of 841
6.1 Features
• Nested Vectored Interrupt Controller that is an integral part of the ARM Cortex-M3
• Tightly coupled interrupt controller provides low interrupt latency
• Controls system exceptions and peripheral interrupts
• In the LPC176x/5x, the NVIC supports 35 vectored interrupts
• 32 programmable interrupt priority levels, with hardware priority level masking
• Relocatable vector table
• Non-Maskable Interrupt
• Software interrupt generation
6.2 Description
The Nested Vectored Interrupt Controller (NVIC) is an integral part of the Cortex-M3. The
tight coupling to the CPU allows for low interrupt latency and efficient processing of late
arriving interrupts.
Refer to the Cortex-M3 User Guide Section 34.4.2
for details of NVIC operation.
6.3 Interrupt sources
Table 50 lists the interrupt sources for each peripheral function. Each peripheral device
may have one or more interrupt lines to the Vectored Interrupt Controller. Each line may
represent more than one interrupt source, as noted.
Exception numbers relate to where entries are stored in the exception vector table.
Interrupt numbers are used in some other contexts, such as software interrupts.
In addition, the NVIC handles the Non-Maskable Interrupt (NMI). In order for NMI to
operate from an external signal, the NMI function must be connected to the related device
pin (P2.10 / EINT0n / NMI). When connected, a logic 1 on the pin will cause the NMI to be
processed. For details, refer to the Cortex-M3 User Guide that is an appendix to this User
Manual.
UM10360
Chapter 6: LPC176x/5x Nested Vectored Interrupt Controller
(NVIC)
Rev. 3 — 19 December 2013 User manual
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