Microsd Card; Limitations; Operating Voltage; Table 10. Hardware Settings For Lpuart - ST STM32L476G-EVAL User Manual

UM1855
In the default configuration of STM32L476G-EVAL, the RX and TX terminals of the LPUART
port are routed to the USB virtual COM port of ST-LINK/V2-1 and, the RX and TX terminals
of USART1 port to the RS-232 connector CN9.
For specific purposes, the TX and RX of the LPUART port of STM32L476ZGT6 can be
routed to the RS-232 connector CN9 instead. As RTS and CTS terminals of CN9 keep
routed to USART1 port, they may block the LPUART communication flow. To avoid this, set
the USART1 hardware flow control off.
The default settings of LPUART are: 115200b/s, 8bits, no parity, 1 stop bit, no flow control.
LPUART port use
Default setting
USB virtual COM port of ST-LINK/V2-1
RS-232 (RX and TX)
2.11

microSD card

The CN18 slot for microSD card is routed to STM32L476ZGT6's SDIO port, accepting SD
(up to 2 Gbytes), SDHC (up to 32 Gbytes) and SDXC (up to 2 Tbytes) cards. One 4-Gbyte
microSD card is delivered as part of STM32L476G-EVAL. The card insertion switch is
routed to the PA8 GPIO port.
Terminal
1
2
3
4
5
For microSD card operation, the LCD glass module daughterboard must be plugged into
CN11 and CN14 in I/O-bridge position, as explained in
2.11.1

Limitations

Due to the share of SDIO port and PA8 terminals, the following limitations apply:
• The microSD card cannot be operated simultaneously with LCD glass module or with
motor control.
•
The microSD card insertion cannot be detected when the PA8 is used as
microcontroller clock output (MCO), one of alternate functions of PA8.
2.11.2

Operating voltage

The supply voltage for STM32L476G-EVAL microSD card operation must be within the
range from 2.7 V to 3.6 V.
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Table 10. Hardware settings for LPUART

R188
In
Out

Table 11. Terminals of CN18 microSD slot

Terminal name (MCU port)
SDIO_D2 (PC10)
SDIO_D3 (PC11)
SDIO_CMD (PD2)
VDD
SDIO_CLK (PC12)
DocID027351 Rev 3
Hardware layout and configuration
R189 R158 R119 R118
don't
In Out Out
Out In In
Terminal Terminal name (MCU port)
6 Vss/GND
7 SDIO_D0 (PC8)
8 SDIO_D1 (PC9)
9 GND
10 MicroSDcard_detect (PA8)
Section 2.15.
JP15 1-2
don't
care care
Out Closed
27/100
99