Clock References; Reset Sources; Table 6. X1-Crystal-Related Solder Bridge Settings; Table 7. X2-Crystal-Related Solder Bridge Settings - ST STM32L476ZG User Manual

UM1855
6.4

Clock references

Two clock references are available on STM32L476G-EVAL for the STM32L476ZG target
microcontroller:
•
32.768 kHz crystal X1, for embedded RTC
•
8 MHz crystal X2, for main clock generator
The main clock can also be generated using an internal RC oscillator. The X2 crystal is in a
socket. It can be removed when the internal RC oscillator is used.
Solder
bridge
SB41
SB33
Solder
bridge
SB24
SB23
6.5

Reset sources

The reset signal of the STM32L476G-EVAL board is active at a low level.

Table 6. X1-crystal-related solder bridge settings

Setting
Default setting.
Open PC14-OSC32_IN terminal is not routed to extension connector CN7. X1 is
used as a clock reference.
PC14-OSC32_IN is routed to extension connector CN7.
Closed R87 must be removed, for the X1 quartz circuit might disturb the clock
reference or source on the daughterboard.
Default setting.
Open PC15-OSC32_OUT terminal is not routed to extension connector CN7.
X1 is used as a clock reference.
PC15-OSC32_OUT is routed to extension connector CN7.
Closed R88 must be removed, for the X1 quartz circuit not to disturb the clock
reference on the daughterboard.

Table 7. X2-crystal-related solder bridge settings

Setting
Default setting.
Open PH0-OSC_IN terminal is not routed to extension connector CN7. X2 is
used as a clock reference.
PH0-OSC_IN is routed to extension connector CN7.
Closed X2 and C54 must be removed, in order not to disturb the clock reference
or source on the daughterboard.
Default setting.
Open PH1-OSC_OUT terminal is not routed to extension connector CN7. X2 is
used as a clock reference.
PH1-OSC_OUT is routed to extension connector CN7.
Closed R95 must be removed, in order not to disturb the clock reference or
source on the daughterboard.
UM1855 Rev 6
Hardware layout and configuration
Description
Configuration
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