Jp1 (Idd); Osc Clock; Table 6. Osc Clock Configurations - ST STM32 Nucleo-32 User Manual

UM1956
6.7

JP1 (IDD)

JP1, labeled IDD, is used to measure the STM32 microcontroller consumption by removing
the jumper and connecting an ammeter:
•
JP1 on: STM32 is powered (default)
•
JP1 off: an ammeter must be connected to measure the STM32 current
If there is no ammeter, STM32 is not powered.
6.8

OSC clock

U2 pin 2 and pin 3 can be used as OSC clock input or as Arduino Nano D8 and D7 GPIO.
There are four ways to configure the pins corresponding to different STM32 and clock usage
(refer to
SB4
ON
OFF
OFF
OFF
OFF
OFF
1. In applications where VCP is used for communication at a speed higher than 9600 bauds, it may be
needed to use this solder bridge configuration, to use 8 MHz clock (MCO from ST-LINK) and get a more
precise frequency.
Boards with STM32Lxxx are delivered with 32.768 KHz crystal (X1). Associated capacitors
and solder bridges (C12, C13 and SB4 to SB8) are configured to support LSE by default.
Boards with STM32Fxxx are delivered without crystal (X1). Associated capacitors (C12,
C13) are not populated and SB4 to SB8 are configured to support HSI by default.
Table 6).

Table 6. OSC clock configurations

Solder bridge
SB17 SB6
OFF OFF
OFF ON
ON OFF
OFF OFF
OFF ON
OFF ON/OFF
SB5 and
SB8
SB7
ON OFF
ON OFF
OFF OFF
OFF ON
ON/OFF OFF
ON OFF
UM1956 Rev 5
Hardware layout and configuration
STM32 Clock configuration
MCO from ST-LINK
connected to OSCIN
(1)
(PF0)
STM32Fxxx
HSI configuration
(default configuration)
MCO from ST-LINK
connected to CKIN
(1)
(PA0)
STM32Lxxx
32K LSE mounted on X1
(default configuration)
Arduino Nano D7
connected to PF0 / PC14
All
Arduino Nano D8
connected to PF1 / PC15
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