This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down list at the bottom of the left panel and select the desired version.

ST Nucleo H723ZG


The STM32 Nucleo-144 board provides an affordable and flexible way for users to try out new concepts and build prototypes by choosing from the various combinations of performance and power consumption features, provided by the STM32 microcontroller. For the compatible boards, the internal or external SMPS significantly reduces power consumption in Run mode.

The ST Zio connector, which extends the ARDUINO® Uno V3 connectivity, and the ST morpho headers provide an easy means of expanding the functionality of the Nucleo open development platform with a wide choice of specialized shields. The STM32 Nucleo-144 board does not require any separate probe as it integrates the ST-LINK V3 debugger/programmer.

The STM32 Nucleo-144 board comes with the STM32 comprehensive free software libraries and examples available with the STM32Cube MCU Package.

Key Features

  • STM32 microcontroller in LQFP144 package

  • Ethernet compliant with IEEE-802.3-2002 (depending on STM32 support)

  • USB OTG or full-speed device (depending on STM32 support)

  • 3 user LEDs

  • 2 user and reset push-buttons

  • 32.768 kHz crystal oscillator

  • Board connectors:

  • USB with Micro-AB

  • Ethernet RJ45 (depending on STM32 support)

  • SWDST Zio connector including Arduino* Uno V3ST

  • ST morpho expansion

  • Flexible power-supply options: ST-LINK USB VBUS or external sources

  • External or internal SMPS to generate Vcore logic supply

  • On-board ST-LINK/V3 debugger/programmer with USB re-enumeration

  • capability: mass storage, virtual COM port and debug port

  • USB OTG full speed or device only

Nucleo H723ZG

More information about the board can be found at the Nucleo H723ZG website.


Nucleo H723ZG provides the following hardware components:

  • STM32H723ZG in LQFP144 package

  • ARM 32-bit Cortex-M7 CPU with FPU

  • Chrom-ART Accelerator

  • Hardware JPEG Codec

  • 550 MHz max CPU frequency

  • VDD from 1.62 V to 3.6 V

  • 1 MB Flash

  • 562 kB SRAM max (376 kb used currently)

  • High-resolution timer (2.1 ns)

  • 32-bit timers(2)

  • 16-bit timers(12)

  • SPI(6)

  • I2C(4)

  • I2S (3)

  • USART(4)

  • UART(4)

  • USB OTG Full Speed and High Speed(1)

  • USB OTG Full Speed(1)

  • CAN FD(2)

  • SAI(2)

  • SPDIF_Rx(4)

  • HDMI_CEC(1)

  • Dual Mode Quad SPI(1)

  • Camera Interface

  • GPIO (up to 114) with external interrupt capability

  • 16-bit ADC(3) with 36 channels / 3.6 MSPS

  • 12-bit DAC with 2 channels(2)

  • True Random Number Generator (RNG)

  • 16-channel DMA

  • LCD-TFT Controller with XGA resolution

Supported Features

The Zephyr nucleo_h723zg board configuration supports the following hardware features:






nested vector interrupt controller



serial port
























True Random number generator

Backup SRAM


Backup SRAM




Other hardware features are not yet supported on this Zephyr port.

The default configuration can be found in the defconfig files: boards/st/nucleo_h723zg/nucleo_h723zg_defconfig

For more details please refer to STM32 Nucleo-144 board User Manual.

Default Zephyr Peripheral Mapping:

The Nucleo H723ZG board features a ST Zio connector (extended Arduino Uno V3) and a ST morpho connector. Board is configured as follows:

  • UART_3 TX/RX : PD8/PD9 (ST-Link Virtual Port Com)

  • USER_PB : PC13

  • LD1 : PB0

  • LD2 : PB7

  • LD3 : PB14

  • I2C : PB8, PB9

  • SPI1 NSS/SCK/MISO/MOSI : PD14PA5/PA6/PB5 (Arduino SPI)

System Clock

Nucleo H723ZG System Clock could be driven by an internal or external oscillator, as well as the main PLL clock. By default, the System clock is driven by the PLL clock at 550MHz, driven by an 8MHz high-speed external clock.

Serial Port

Nucleo H723ZG board has 4 UARTs and 4 USARTs. The Zephyr console output is assigned to UART3. Default settings are 115200 8N1.

Backup SRAM

In order to test backup SRAM you may want to disconnect VBAT from VDD. You can do it by removing SB52 jumper on the back side of the board.

Programming and Debugging

Currently the nucleo_h723zg board supports stm32cubeprogrammer (default), OpenOCD and J-Link debuggers.


Official OpenOCD support for this board was added on October ‘20. Make sure your openocd version is older than that. Following links may be helpful: OpenOCD installing Debug Version and OpenOCD installing with ST-LINK V3 support


Check if your ST-LINK V3 has newest FW version. It can be done with STM32CubeIDE


Nucleo H723ZG board includes an ST-LINK/V3 embedded debug tool interface.

First, connect the NUCLEO-H723ZG to your host computer using the USB port to prepare it for flashing. Then build and flash your application.

Here is an example for the Hello World application.

Run a serial host program to connect with your NUCLEO-H723ZG board.

$ minicom -b 115200 -D /dev/ttyACM0

or use screen:

$ screen /dev/ttyACM0 115200

Build and flash the application:

# From the root of the zephyr repository
west build -b nucleo_h723zg samples/hello_world
west flash

You should see the following message on the console:

$ Hello World! nucleo_h723zg

Blinky example can also be used:

# From the root of the zephyr repository
west build -b nucleo_h723zg samples/basic/blinky
west flash


You can debug an application in the usual way. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b nucleo_h723zg samples/hello_world
west debug