User Manual

XR‐21A W
IFI modu
le
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2. Pindefinition
XR-21Amodulehas16pins，featuresareshowninFigure2.1and
Table2.2.
Figure2.1XR-21APindiagram 
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Table2.2Pindescription
Number Name Functiondescription
1 RST Reset
2 PA12 ADC_CH2;PWM4/ECT4;IR_TX；EINTA12
3 PB2 SWD_TMS；JTAG_TD0；PWM6/ECT6；EINTB2；
downloadmode:pull-down，workmode:donothandle
orpull-up