STM32F405 datasheet(23/204 Pages) STMICROELECTRONICS

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DS8626 Rev 9

23/203

STM32F405xx, STM32F407xx

Description

2.2.9

Flexible static memory controller (FSMC)

The FSMC is embedded in the STM32F405xx and STM32F407xx family. It has four Chip

Select outputs supporting the following modes: PCCard/Compact Flash, SRAM, PSRAM,

NOR Flash and NAND Flash.

Functionality overview:

•

Write FIFO

•

Maximum FSMC_CLK frequency for synchronous accesses is 60 MHz.

LCD parallel interface

The FSMC can be configured to interface seamlessly with most graphic LCD controllers. It

supports the Intel 8080 and Motorola 6800 modes, and is flexible enough to adapt to

specific LCD interfaces. This LCD parallel interface capability makes it easy to build cost-

effective graphic applications using LCD modules with embedded controllers or high

performance solutions using external controllers with dedicated acceleration.

2.2.10

Nested vectored interrupt controller (NVIC)

The STM32F405xx and STM32F407xx embed a nested vectored interrupt controller able to

manage 16 priority levels, and handle up to 82 maskable interrupt channels plus the 16

interrupt lines of the Cortex®-M4 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.

2.2.11

External interrupt/event controller (EXTI)

The external interrupt/event controller consists of 23 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 140 GPIOs can be connected

to the 16 external interrupt lines.

2.2.12

Clocks and startup

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

16 MHz internal RC oscillator is factory-trimmed to offer 1% accuracy over the full

temperature range. 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 168 MHz. Similarly, full interrupt management of the PLL

STM32F405 数据表(PDF) 23 Page - STMicroelectronics

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