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Table 9: Pin Definition of UARTs
Pin Name
Pin No.
UART1_RXD
37
UART1_TXD
38
USB_DP
6
USB_DM
7
GPIO0
40
GPIO1
39
GPIO40
69
GPIO41
35
The UART1 can be used for command communication and data transmission. It is recommended to use
the CH340 serial port tool and set the communication rate to 2000000 bps during flash download or
firmware upgrading. The UART1 connection between the module and the MCU is illustrated below.
3.4.4. SDIO Interface
In the case of multiplexing the module provides 1 SDIO 2.0 interface It can be used as a host to read
external SD cards or as a slave communicating with an external host. It allows a maximum 40 MHz clock
speed and supports 1 bit (default) or 4 bits data bus mode.
FCM561D-P_Hardware_Design
Multiplexing Function
-
-
UART1_CTS
UART1_RTS
UART2_TXD
UART2_RXD
UART3_RXD
UART3_TXD
Figure 4: UART1 Connection
Wi-Fi&Bluetooth Module Series
I/O
Comment
DI
UART1 receive
DO
UART1 transmit
DI
Clear to send signal to the module
DO
Request to send signal from the module
DO
UART2 transmit
DI
UART2 receive
DI
UART3 receive
DO
UART3 transmit
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