Table 1: List of all available digital I/O pins
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 | Backplane Header Pin | ||
| Class | Circuit Name | Port | Bit | Backplane System Slot | Resistor | ||
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| LCD | LCD0 | Port C | 0 | A18 | JP6, pin 9 | ||
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 | LCD1 | Port C | 1 | B18 | JP6, pin 10 | ||
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 | LCD2 | Port C | 2 | A17 | JP6, pin 11 | ||
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 | LCD3 | Port C | 3 | B17 | JP6, pin 12 | ||
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 | LFRM | Port C | 4 | A15 | JP6, pin 2 | ||
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 | LLP | Port C | 5 | B15 | JP6, pin 3 | ||
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 | LCLK | Port C | 6 | A16 | JP6, pin 4 | ||
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 | LADC | Port C | 7 | B16 | JP6, pin 1 | ||
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 | LCONTRAST | Port F | 0 | A14 | JP6, pin14 | ||
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| EEPROM | EE MOSI | Port E | 0 | B13 | 
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 | EE MISO | Port E | 1 | B14 | 
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 | EE CLK | Port E | 2 | A13 | 
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| SPI | SPI nINT0 | Port D | 5 | A24 | 
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 | SPI nINT1 | Port D | 6 | B23 | 
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 | SPI MOSI | Port J | 0 | B28 | 
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 | SPI MISO | Port J | 1 | A27 | 
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 | SPI CLK | Port J | 2 | A29 | 
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 | SPI nSS | Port J | 3 | B26 | 
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 | SPI nRDY | Port K | 0 | B27 | 
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 | SPI CS0 | Port K | 4 | B24 | 
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 | SPI CS1 | Port K | 5 | A25 | 
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 | SPI CS2 | Port K | 6 | B25 | 
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 | SPI CS3 | Port K | 7 | A26 | 
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| ICE_DEBUG | EMU IRQ | Port G | 2 | B7 | 
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 | EMU PD | Port G | 3 | A7 | 
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 | EMU CS | Port G | 4 | B8 | 
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 | EMU BRK | Port G | 5 | A8 | J7, pin 1 | ||
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