Reference design AN4938
34/46 AN4938 Rev 4
8 Reference design
8.1 Reference design description
The reference design shown in Figure 18 is based on the STM32H753XI, a highly
integrated microcontroller that combines the ARM
®
Cortex
®
-M7 32-bit RISC core running at
up to 400 MHz with up to 2 Mbyte dual-bank Flash memory and 1 Mbytes of RAM (including
19
2 Kbytes of TCM RAM, 864 Kbytes of user RAM and 4 Kbytes of backup SRAM).
This reference design can be easy ported to othe
r devices. Specific requirements must be
respected for the following devices:
• Devices featuring the SMPS: four additional pins must be used to supply the internal
SM
PS block (refer to the corresponding datasheet for more details).
• Devices featuring a DSI internal regulator: four additional pins must be used to supply
the inte
rnal DSI regulator block (refer to the corresponding datasheet for more details).
8.1.1 Clocks
Two clock sources are used for the microcontroller:
• LSE: X2– 32.768 kHz crystal for the embedded RTC.
• HSE: X1– 25 MHz crystal.
Refer to Section 4: Clocks on page 21.
8.1.2 Reset
The reset signal of STM32H753XI device is low active and the reset sources include:
• Reset button B1
• Debugging Tools from JTAG/SWD connector CN15 and ETM trace connector CN12
Refer to Section 2.3: Reset and power supply supervisor on page 15.
8.1.3 Boot mode
Refer to Section 5: Boot configuration on page 25.
8.1.4 SWJ interface
Refer to Section 6: Debug management on page 28.
8.1.5 Power supply
Refer to Section 2: Power supplies on page 7.
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