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UART1_RXD
30
UART2_TXD
19
UART2_RXD
20
The UART1 can be used for downloading, debugging and AT command communication with the default
baud rate of 115200 bps. The UART1 connection between the module and the MCU is illustrated below.
The UART2 can be used for the output of partial logs with the debugging tools, and the default baud rate
is 921600 bps. The following is reference design of UART2.
3.4.2. SPI
In the case of multiplexing, the module provides 1 SPI that supports both master and slave modes. The
maximum clock frequency of the interface can reach 30 MHz in master mode, and 20 MHz in slave
mode.
FGM842D_Hardware_Design
DI
UART1 receive
DO
UART2 transmit
DI
UART2 receive
Figure 2: UART1 Connection
Figure 3: UART2 Reference Design
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