STM32L100R8 datasheet(18/103 Pages) STMICROELECTRONICS

18 / 103 page

Functional overview

STM32L100C6 STM32L100R8/RB

18/103

DocID024295 Rev 5

Nested vectored interrupt controller (NVIC)

The ultra-low-power STM32L100C6 and STM32L100R8/RB devices embed a nested

vectored interrupt controller able to handle up to 45 maskable interrupt channels (not

including the 16 interrupt lines of Cortex-M3) and 16 priority levels.

•

Closely coupled NVIC gives low-latency interrupt processing

•

Interrupt entry vector table address passed directly to the core

•

Closely coupled NVIC core interface

•

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

This hardware block provides flexible interrupt management features with minimal interrupt

latency.

3.3

Reset and supply management

3.3.1

Power supply schemes

•

VDD = 1.8 to 3.6 V: external power supply for I/Os and the internal regulator.

Provided externally through VDD pins.

•

VSSA, VDDA = 1.8 to 3.6 V: external analog power supplies for ADC, reset blocks, RCs

and PLL.

VDDA and VSSA must be connected to VDD and VSS, respectively.

3.3.2

Power supply supervisor

The device has an integrated ZEROPOWER power-on reset (POR)/power-down reset

(PDR) that can be coupled with a brownout reset (BOR) circuitry.

BOR is activated at power-on and the device operates between 1.8 V and 3.6 V.

After the VDD threshold is reached, the option byte loading process starts, either to confirm

or modify default thresholds, or to disable the BOR permanently.

BOR ensures proper operation starting from 1.8 V whatever the power ramp-up phase

before it reaches 1.8 V.

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