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| Pin number | Name |
Functions |
| 1 | VCC | Themodulepowersupplypinneedstobeshort connectedtopin2tosupplypowertothemodule |
| 2 | 3.3V | 3.3Vpowerpin |
| 3 | 3.3V | 3.3Vpowerpin |
| 4 | VIO | MCUpowersupplypin,needstobeshortedto pin3tosupplypowertotheMCU |
| 5 | GND | Baseboardreferenceground |
| 6 | REST | MCUexternalresetpin |
| 7 | SWIM | MCUSWIMpin |
| 8 | VIO | MCUpowersupplypin |
| 9 | PC0 | Moduleresetpin |
| 10 | PB7 | ModuleMISOPin |
| 11 | PB6 | ModuleMOSIPin |
| 12 | PB5 | ModuleSCLKPin |
| 13 | PB4 | ModuleNSSPin |
| 14 | TXD | MCUSerialTXD |
| 15 | RXD | MCUserialRXD |
| 16 | M1 | Modulemodeswitchingpins(seemodule productmanualfordetails) |
| 17 | GND | Baseboardreferenceground |
| 18 | M0 | Modulemodeswitchingpins(seemodule datasheetfordetails) |
| 19 | GND | Chassisreferenceground |
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