Extension connector EXT4 is a special connector for LCD displays. The physical connector is a TE Connectivity 5-1734839-0 FPC connector.
| Pin on EXT4 | XMEGA pin | Function | Shared functionality |
|---|---|---|---|
| 1 [ID] | - | - | Communication line to ID chip on extension board |
| 2 [GND] | - | - | GND |
| 3 [D0] | PJ0 | D0 | SRAM |
| 4 [D1] | PJ1 | D1 | SRAM |
| 5 [D2] | PJ2 | D2 | SRAM |
| 6 [D3] | PJ3 | D3 | SRAM |
| 7 [GND] | - | - | GND |
| 8 [D4] | PJ4 | D4 | SRAM |
| 9 [D5] | PJ5 | D5 | SRAM |
| 10 [D6] | PJ6 | D6 | SRAM |
| 11 [D7] | PJ7 | D7 | SRAM |
| 12 [GND] | - | - | GND |
| 13 [D8] | - | - | |
| 14 [D9] | - | - | |
| 15 [D10] | - | - | |
| 16 [D11] | - | - | |
| 17 [GND] | - | - | GND |
| 18 [D12] | - | - | |
| 19 [D13] | - | - | |
| 20 [D14] | - | - | |
| 21 [D15] | - | - | |
| 22 [GND] | - | - | GND |
| 23 [D16] | - | - | |
| 24 [D17] | - | - | |
| 25 [D18] | - | - | |
| 26 [D19] | - | - | |
| 27 [GND] | - | - | GND |
| 28 [D20] | - | - | |
| 29 [D21] | - | - | |
| 30 [D22] | - | - | |
| 31 [D23] | - | - | |
| 32 [GND] | - | - | GND |
| 33 [PCLK / CMD_DATA_SEL] | PJ0 ALE1(1) | A0 | SRAM |
| 34 [VSYNC / CS] | PH7 | EBI CS3 | |
| 35 [HSYNC / WE] | PH0 | EBI NWE | SRAM |
| 36 [DATA ENABLE / RE] | PH1 | EBI NRD | SRAM |
| 37 [SPI SCK] | PC7 | SPIC SCK | EXT1, EXT2, EXT3, and Alternate signal header |
| 38 [SPI MOSI] | PC5 | SPIC MOSI | EXT1, EXT2, and EXT3 |
| 39 [SPI MISO] | PC6 | SPIC MISO | EXT1, EXT2, EXT3, and Alternate signal header |
| 40 [SPI SS] | PB1 | GPIO | |
| 41 [DISP ENABLE] | PK5 | GPIO | EDBG DGI |
| 42 [TWI SDA] | PC0 | TWIC SDA | EXT1 and EDBG |
| 43 [TWI SCL] | PC1 | TWIC SCL | EXT1 and EDBG |
| 44 [IRQ1] | PK4 | GPIO | EDBG DGI |
| 45 [IRQ2] | PK6 | GPIO | EDBG DGI |
| 46 [PWM] | PF5 | TCF1 OC1B | |
| 47 [RESET] | PA5 | GPIO | |
| 48 [VCC] | - | VCC_P3V3 | |
| 49 [VCC] | - | VCC_P3V3 | |
| 50 [GND] | - | GND |