User's Manual

XR-31B WIFI module
Copyright © 2019 Shenzhen JiXinInteligence Co., Ltd All Rights Reserved
Page 7 of 14
2. Pin definition
XR-31B module has 16 pins，features are shown in Figure 2.1 and
Table 2.2.
Figure 2.1 XR-31B Pin diagram
Table 2.2 Pin description
Number
Name
Function description
1
GND
ground
2
TX0
UART0_TX;JTAG_TMS；PWM4/ECT4；SWD_TMS；EINTB0
3
RX0
UART0_RX；JTAG_TCK；PWM5/ECT5；SWD_TCK；EINTB1
4
PB3
SWD_TCK；JTAG_TDI；PWM7/ECT7；EINTB3;
download mode :pull-down, Run mode :do
not handle or pull-up