STM32F746哪些IO口可以作为并口直接与AD芯片(8个并口的数字输出)连接。

发布网友 发布时间：2022-04-29 02:06

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热心网友 时间：2023-10-03 07:31

The STM32F745xx and STM32F746xx devices are based on the high-performance  ARM®Cortex®-M7 32-bit RISC core operating at up to 216 MHz frequency. The  Cortex®-M7 core features a single floating point unit (SFPU) precision which  supports all ARM®single-precision data-processing instructions and data types.  It also implements a full set of DSP instructions and a memory protection unit  (MPU) which enhances the application security.

The STM32F745xx and STM32F746xx devices incorporate high-speed embedded  memories with a Flash memory up to 1 Mbyte, 320 Kbytes of SRAM (including 64  Kbytes of Data TCM RAM for critical real-time data), 16 Kbytes of instruction  TCM RAM (for critical real-time routines), 4 Kbytes of backup SRAM available in  the lowest power modes, and an extensive range of enhanced I/Os and peripherals  connected to two APB buses, two AHB buses, a 32-bit multi-AHB bus matrix and a  multi layer AXI interconnect supporting internal and external memories  access.

All the devices offer three 12-bit ADCs, two DACs, a low-power RTC,  thirteen general-purpose 16-bit timers including two PWM timers for motor  control and one low-power timer available in Stop mode, two general-purpose  32-bit timers, a true random number generator (RNG). They also feature standard  and advanced communication interfaces.

Key Features

Core: ARM® 32-bit Cortex®-M7 CPU with FPU, adaptive real-time accelerator  (ART Accelerator™) and L1-cache: 4KB data cache and 4KB instruction cache,  allowing 0-wait state execution from embedded Flash memory and external  memories, frequency up to 216 MHz, MPU, 462 DMIPS/2.14 DMIPS/MHz (Dhrystone  2.1), and DSP instructions.

Memories

Up to 1MB of Flash memory

1024 bytes of OTP memory

SRAM: 320KB (including 64KB of data TCM RAM for critical real-time data) +  16KB of instruction TCM RAM (for critical real-time routines) + 4KB of backup  SRAM (available in the lowest power modes)

Flexible external memory controller with up to 32-bit data bus: SRAM,  PSRAM, SDRAM/LPSDR SDRAM, NOR/NAND memories

Dual mode Quad-SPI

LCD parallel interface, 8080/6800 modes

LCD-TFT controller up to XGA resolution with dedicated Chrom-ART  Accelerator™ for enhanced graphic content creation (DMA2D)

Clock, reset and supply management

1.7 V to 3.6 V application supply and I/Os

POR, PDR, PVD and BOR

Dedicated USB power

4-to-26 MHz crystal oscillator

Internal 16 MHz factory-trimmed RC (1% accuracy)

32 kHz oscillator for RTC with calibration

Internal 32 kHz RC with calibration

Low-power

Sleep, Stop and Standby modes

VBATsupply for RTC, 32×32 bit backup registers + 4KB backup SRAM

3×12-bit, 2.4 MSPS ADC: up to 24 channels and 7.2 MSPS in triple  interleaved mode

2×12-bit D/A converters

Up to 18 timers: up to thirteen 16-bit (1x low- power 16-bit timer  available in Stop mode) and two 32-bit timers, each with up to 4 IC/OC/PWM or  pulse counter and quadrature (incremental) encoder input. All 15 timers running  up to 216 MHz. 2x watchdogs, SysTick timer

General-purpose DMA: 16-stream DMA controller with FIFOs and burst  support

Debug mode

SWD & JTAG interfaces

Cortex®-M7 Trace Macrocell™

Up to 168 I/O ports with interrupt capability

Up to 164 fast I/Os up to 108 MHz

Up to 166 5 V-tolerant I/Os

Up to 25 communication interfaces

Up to 4× I2C interfaces (SMBus/PMBus)

Up to 4 USARTs/4 UARTs (27 Mbit/s, ISO7816 interface, LIN, IrDA, modem  control)

Up to 6 SPIs (up to 50 Mbit/s), 3 with muxed simplex I2S for audio class  accuracy via internal audio PLL or external clock

2 x SAIs (serial audio interface)

2 × CANs (2.0B active) and SDMMC interface

SPDIFRX interface

HDMI-CEC

Advanced connectivity

USB 2.0 full-speed device/host/OTG controller with on-chip PHY

USB 2.0 high-speed/full-speed device/host/OTG controller with dedicated  DMA, on-chip full-speed PHY and ULPI

10/100 Ethernet MAC with dedicated DMA: supports IEEE 1588v2 hardware,  MII/RMII

8- to 14-bit parallel camera interface up to 54 Mbyte/s

True random number generator

CRC calculation unit

RTC: subsecond accuracy, hardware calendar

96-bit unique ID

利用STM32F746单片机的P0端口的P0.0-P0.7连接到一个共阴数码管的a-h的笔段上，数码管的公共端接地。在数码管上循环显示0-9数字，时间间隔0.2秒。

2. 电路原理图

图4.7.1

3. 系统板上硬件连线

把“单片机系统”区域中的P0.0/AD0-P0.7/AD7端口用8芯排线连接到“四路静态数码显示模块”区域中的任一个数码管的a-h端口上;要求：P0.0/AD0与a相连，P0.1/AD1与b相连，P0.2/AD2与c相连，……，P0.7/AD7与h相连。

4.程序设计内容

(1.LED数码显示原理

七段LED显示器内部由七个条形发光二极管和一个小圆点发光二极管组成，根据各管的极管的接线形式，可分成共阴极型和共阳极型。

LED数码管的g~a七个发光二极管因加正电压而发亮，因加零电压而不以发亮，不同亮暗的组合就能形成不同的字形，这种组合称之为字形码，下面给出共阴极的字形码见表2

“0”

3FH

“8”

7FH

“1”

06H

“9”

6FH

“2”

5BH

“A”

77H

“3”

4FH

“b”

7CH

“4”

66H

“C”

39H

“5”

6DH

“d”

5EH

“6”

7DH

“E”

79H

“7”

07H

“F”

71H

(2.由于显示的数字0-9的字形码没有规律可循，只能采用查表的方式来完成我们所需的要求了。这样我们按着数字0-9的顺序，把每个数字的笔段代码按顺序排好!建立的表格如下所示：TABLE　DB　3FH，06H，5BH，4FH，66H，6DH，7DH，07H，7FH，6FH

5.程序框图

芯片供应：拍明芯城

品牌：st

热心网友 时间：2023-10-03 07:32