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| pin number | purpose |
| 1 | mode bit 0 |
| 2 | ground |
| 3 | mode bit 1 |
| 4 | ground |
| 5 | mode bit 2 |
| 6 | ground |
| 7 | mode bit 3 |
| 8 | ground |
| 9 | mode bit 4 |
| 10 | ground |
| 11 | mode bit 5 |
| 12 | ground |
| 13 | level 1 accept |
| 14 | ground |
| 15 | 9.5MHz clock |
| 16 | ground |
| 17 | 38 MHz clock (4X clock) |
| 18 | ground |
| 19 | ground |
| 20 | ground |