User's Manual

XR-31B WIFI module
Copyright © 2019 Shenzhen JiXinInteligence Co., Ltd All Rights Reserved
Page 8 of 14
5
PB2
SWD_TMS；JTAG_TD0；PWM6/ECT6；EINTB2；
download mode: pull-down，work mode: do not handle
or pull-up
6
PA23
EXT_DCDC_PUP；WUPIO9(wake up IO) ； EINTA23；
default cannot be high
7
PA22
UART2_TX；PWM3/ECT3；SPI1_CS0；WUPIO8；EINTA22
8
GND
ground
9
PA21
UART2_RX; PWM2/ECT2；SPI1_CLK；WUPIO7；EINTA21
10
PA20
UART2_CTS;TWI0_SDA;PWM1/ECT1;SPI1_MISO;
WUPIO6; EINTA20
11
PA19
UART2_RTS;TWI0_SCL;PWM0/ECT0;SPI1_MOSI;
WUPIO5; EINTA19
12
PA13
LXTAL2; ADC_CH3;PWM5/ECT5;UART1_TX;EINTA13
13
PA12
LXTAL1; ADC_CH2;PWM4/ECT4;IR_TX;EINTA12
14
RST
Reset
15
VDD_ANA
Voltage output 1.8V
16
VCC
power supply 2.7~5.5V