Datasheet
Functional overview STM32L431xx
32/200 DocID028800 Rev 1
3.14 Interrupts and events
3.14.1 Nested vectored interrupt controller (NVIC)
The devices embed a nested vectored interrupt controller able to manage 16 priority levels,
and handle up to 67 maskable interrupt channels plus the 16 interrupt lines of the Cortex
®
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M4.
The NVIC benefits are the following:
• Closely coupled NVIC gives low latency interrupt processing
• Interrupt entry vector table address passed directly to the core
• Allows early processing of interrupts
• Processing of late arriving higher priority interrupts
• Support for tail chaining
• Processor state automatically saved
• Interrupt entry restored on interrupt exit with no instruction overhead
The NVIC hardware block provides flexible interrupt management features with minimal
interrupt latency.
3.14.2 Extended interrupt/event controller (EXTI)
The extended interrupt/event controller consists of 37 edge detector lines used to generate
interrupt/event requests and wake-up the system from Stop mode. Each external line can be
independently configured to select the trigger event (rising edge, falling edge, both) and can
be masked independently A pending register maintains the status of the interrupt requests.
The internal lines are connected to peripherals with wakeup from Stop mode capability. The
EXTI can detect an external line with a pulse width shorter than the internal clock period. Up
to 83 GPIOs can be connected to the 16 external interrupt lines.
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