Reset Circuit; Clock Circuit; Jumper Description - OLIMEX STM32-H107 User Manual

POWER SUPPLY CIRCUIT
STM32-H107 can take power from three sources:
–
–
–

RESET CIRCUIT

STM32-H107 reset circuit includes EXT1 pin 3, EXT2 pin 3, JTAG connector pin 15,
STM32F107VCT6 pin 14 (NRST) and RESET button.

CLOCK CIRCUIT

Quartz crystal 25 MHz is connected to STM32F107 pin 12 (OSC_IN) and pin 13
(OSC_OUT).
Quartz crystal 32.768kHz is connected to STM32F107 pin 8 (PC14/OSC32_IN) and
pin 9 (PC15/OSC32_OUT).

JUMPER DESCRIPTION

PWR_SEL
When position 1-2 is shorted – the board is power supplied from JTAG.
When position 3-4 is shorted – the board is power supplied from USB_OTG.
When position 5-6 is shorted – the board is power supplied from External power
source.
Default state is – position 5-6 – shorted.
B0_1/B0_0
When this jumper is in position B0_1 – BOOT0 is connected to 3.3V, and when the
jumper is in position B0_0 – BOOT0 is connected to GND.
Default state is B0_0.
B1_1/B1_0
When this jumper is in position B1_1 – BOOT1 is connected to 3.3V, and when the
jumper is in position B1_0 – BOOT1 is connected to GND.
Default state is B1_0.
3.3V_MCU_E
Enable 3.3V microcontroller power supply
Default state is closed.
3.3V_E
Enable regulator VR2 (3.3V) - LM1117
Default state is closed.
R-T
Connects RST to TRST
PWR connector where 9 V DC or 6 V AC is applied by external power source.
+5V_ OTG-PWR from USB OTG
+5V_JTAG from JTAG
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