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9
Pin# Type Name
（Mainfunction）
Alternatefunctions PINconnection
(whennotusing)
JP1 I/O SDA
GPIO0,CTS,SPI_1:MOSI
(master)
floating
JP2 I/O ptxd
P0,A/D
SPI_2:MOSI(master&slave)
floating
JP3 I/O SCL
GPIO1,RTS,
SPI_1:CLK(master)
floating
JP4 I/O prxd
P2,
SPI_2:CS(slave)
floating
JP5 I/O SPI_CS
P26,XTALO32K,SPI_2:CS
(slave)
floating
JP6 I/O SPI_MOSI
P27,XTALI32K,SPI_2:MOSI
(master&slave)
floating
JP7 I/O P28 P13,A/D,PWM3 floating
JP8 I/O ADC2
P1,IR_TX,
SPI_2:MISO(master&slave)
floating
JP9 S VDDIO 3.3V
JP10 I/O ADC1 P8,A/D floating
JP11 I NRST
Active‐lowsystemreset
I/O
JP12 S GND
JP13 I/O SPI_CLK
P24,
SPI_2:CLK(master&slave),
SPI_1:MISO(master)
floating
JP14 I/O P14 P38,A/D,PWM2 floating
JP15 I/O P4
IR_TX,SPI_2:MOSI(master)
floating
JP16 I/O SPI_MISO
P25,SPI_2:MISO
(master&slave)
floating
JP17 S VDDIO 3.3V
JP18 I RXD GPIO3 floating
JP19 O TXD GPIO2 floating
JP20 I NRST
Active‐lowsystemreset
I/O
JP21 S GND
Notes:Foreachpinfunction,pleaserefertoALX41Xusermanual.
1.2.3 MechanicalSize