| Pin Number | Pin Name | Function |
|---|---|---|
| 1 | CS | Card Select (Requires pull-up) |
| 2 | DI | Data Input |
| 3 | VSS1 | Ground |
| 4 | VDD | Supply Voltage (3.3V) |
| 5 | SCLK | Clock |
| 6 | VSS2 | Ground |
| 7 | DO | Data output (Requires pull-up) |
| 8 | IRQ | Interrupt (Requires pull-up) |
| 9 | NC | Unused (Requires pull-up) |
AVR Circuit
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