User Manual

XR‐21A W
IFI modu
le
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Copyright©2019  ShenzhenJiXinInteligenceCo.,LtdAllRightsReserved 
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1.2 Features
 IEEE802.11b/g/n,1x1SISO2.4GHz
 Built-in ARM Cortex-M4F 32bit MCU with main frequency from 32KHz to
160MHz,supportRTOS
 Built-in256KBSRAMand160KBROM
 SupportexternalFlashandeXecuteInPlace(XIP) 
 8shareduniversalDMAchannels
 Built-in6ways12bitSARtypeA/Dconverter
 Built-inWi-FiMAC/BB/RF/PA/LNA
 SupportWEP,WPA/WPA2,WPS2.0
 SupportUART/GPIO/ADC/PWM/I2C/SPIinterface 
 UseSMD-16assemblemodel
 Supportmultiplesleepmodesandcurrentaslowas4uAindeepsleep
mode
 SupportAES/DES/3DES/SHA/MD5/CRCencryptionengine
 SupportSTA/AP/STA+APoperationmodes
 SupportSmartConfig/AirKiss(WeChat)
 SupportLocalfirmwareupgradeusingUARTandremoteupgrade（FOTA） 
 HasuniversalandfriendlyATcommandset
 Supportsecondarydevelopment,supportWindows,Linuxdevelopment
environment