ST STM32 User Manual

UM1974 Rev 9 25/85
UM1974 Hardware layout and configuration
84
6.8 OSC clock
6.8.1 OSC clock supply
There are four ways to configure the pins corresponding to the external high-speed clock
(HSE):
• MCO from ST-LINK (Default): MCO output of ST-LINK is used as input clock. This
frequency cannot be changed, it is fixed at 8 MHz and connected to the
PF0/PH0-OSC_IN of STM32 microcontroller. The configuration must be:
– SB148 OFF
– SB112 and SB149 ON
– SB8 and SB9 OFF
• HSE on-board oscillator from X3 crystal (not provided): for typical frequencies and
its capacitors and resistors, refer to the STM32 microcontroller datasheet and to the
Oscillator design guide for STM8S, STM8A and STM32 microcontrollers Application
note (AN2867) for the oscillator design guide. The X3 crystal has the following
characteristics: 8 MHz, 8 pF, 20 ppm. It is recommended to use NX3225GD-8.000M-
EXS00A-CG04874 manufactured by NIHON DEMPA KOGYO CO., LTD. The
configuration must be:
– SB148 and SB163 OFF
– SB8 and SB9 ON
– C37 and C38 soldered with 4.3 pF capacitors
– SB112 and SB149 OFF
• Oscillator from external PF0/PH0: from an external oscillator through the pin 29 of
the CN11 connector. The configuration must be:
– SB148 ON
– SB112 and SB149 OFF
– SB8 and SB9 removed
• HSE not used: PF0/PH1 and PF1/PH1 are used as GPIOs instead of as clock. The
configuration must be:
– SB148 and SB163 ON
– SB112 and SB149 (MCO) OFF
– SB8 and SB9 removed

ST STM32 Specifications

General

Series	STM32
Category	Microcontrollers
Core	ARM Cortex-M0, Cortex-M0+, Cortex-M3, Cortex-M4, Cortex-M7, Cortex-M33
Clock Speed	Up to 480 MHz
GPIO Pins	Up to 144
Communication Interfaces	I2C, SPI, USART, USB, CAN, Ethernet
Package Types	LQFP, BGA, WLCSP
ADC Resolution	12-bit, 16-bit (varies by series)
DAC Resolution	12-bit (varies by series)
Operating Temperature	-40°C to +85°C or +105°C