STM32F756ZG datasheet(22/228 Pages) STMICROELECTRONICS

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Functional overview

STM32F756xx

22/228

DocID027589 Rev 4

2.12

Nested vectored interrupt controller (NVIC)

The devices embed a nested vectored interrupt controller able to manage 16 priority levels,

and handle up to 97 maskable interrupt channels plus the 16 interrupt lines of the Cortex®-

M7 with FPU core.

•

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 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 minimum interrupt

latency.

2.13

External interrupt/event controller (EXTI)

The external interrupt/event controller consists of 24 edge-detector lines used to generate

interrupt/event requests. Each 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 EXTI can detect an external line with a

pulse width shorter than the Internal APB2 clock period. Up to 168 GPIOs can be connected

to the 16 external interrupt lines.

2.14

Clocks and startup

On reset the 16 MHz internal HSI RC oscillator is selected as the default CPU clock. The

16 MHz internal RC oscillator is factory-trimmed to offer 1% accuracy. The application can

then select as system clock either the RC oscillator or an external 4-26 MHz clock source.

This clock can be monitored for failure. If a failure is detected, the system automatically

switches back to the internal RC oscillator and a software interrupt is generated (if enabled).

This clock source is input to a PLL thus allowing to increase the frequency up to 216 MHz.

Similarly, full interrupt management of the PLL clock entry is available when necessary (for

example if an indirectly used external oscillator fails).

Several prescalers allow the configuration of the two AHB buses, the high-speed APB

(APB2) and the low-speed APB (APB1) domains. The maximum frequency of the two AHB

buses is 216 MHz while the maximum frequency of the high-speed APB domains is

108 MHz. The maximum allowed frequency of the low-speed APB domain is 54 MHz.

The devices embed two dedicated PLL (PLLI2S and PLLSAI) which allow to achieve audio

class performance. In this case, the I2S and SAI master clock can generate all standard

sampling frequencies from 8 kHz to 192 kHz.

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