Ethernut 2 Ports
Expansion Port
| Pin | Signal | Description |
|---|---|---|
| 1 | VCC3 +3.3V Power Supply | Output from on-board regulator |
| 2 | VCC3 +3.3V Power Supply | Output from on-board regulator |
| 3 | VCC5 +5V Power Supply | Output from on-board regulator |
| 4 | VCC5 +5V Power Supply | Output from on-board regulator |
| 5 | GND Digital Ground | |
| 6 | GND Digital Ground | |
| 7 | GND Digital Ground | |
| 8 | GND Digital Ground | |
| 9 | MR\ Hardware Reset Input |
Drive low to reset Ethernut. Pressing the reset button pulls this line low. Also driven low during SPI/JTAG programming. |
| 10 | DC Unregulated DC Power Supply |
Can drive external regulators or may be used as alternative DC input for Ethernut. |
| 11 | VCC5 +5V Power Supply | Output from on-board regulator |
| 12 | VCC5 +5V Power Supply | Output from on-board regulator |
| 13 | RD\ External Memory Bus Read Strobe |
External memory bus. Data bus and lower 8 address bus bits are 3V logic, but 5V tolerant. |
| 14 | WR\ External Memory Bus Write Strobe | |
| 15 | D0 External Data Bus Bit 0 | |
| 16 | D1 External Data Bus Bit 1 | |
| 17 | D2 External Data Bus Bit 2 | |
| 18 | D3 External Data Bus Bit 3 | |
| 19 | D4 External Data Bus Bit 4 | |
| 20 | D5 External Data Bus Bit 5 | |
| 21 | D6 External Data Bus Bit 6 | |
| 22 | D7 External Data Bus Bit 7 | |
| 23 |
A0 External Address Bus Bit 0 PA0 General Purpose I/O Port A Bit 0 |
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| 24 |
A1 External Address Bus Bit 1 PA1 General Purpose I/O Port A Bit 1 |
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| 25 |
A2 External Address Bus Bit 2 PA2 General Purpose I/O Port A Bit 2 |
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| 26 |
A3 External Address Bus Bit 3 PA3 General Purpose I/O Port A Bit 3 |
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| 27 |
A4 External Address Bus Bit 4 PA4 General Purpose I/O Port A Bit 4 |
|
| 28 |
A5 External Address Bus Bit 5 PA5 General Purpose I/O Port A Bit 5 |
|
| 29 |
A6 External Address Bus Bit 6 PA6 General Purpose I/O Port A Bit 6 |
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| 30 |
A7 External Address Bus Bit 7 PA7 General Purpose I/O Port A Bit 7 |
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| 31 |
A8 External Address Bus Bit 8 PC0 General Purpose I/O Port C Bit 0 |
|
| 32 |
A9 External Address Bus Bit 9 PC1 General Purpose I/O Port C Bit 1 |
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| 33 |
A10 External Address Bus Bit 10 PC2 General Purpose I/O Port C Bit 2 |
|
| 34 |
A11 External Address Bus Bit 11 PC3 General Purpose I/O Port C Bit 3 |
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| 35 |
A12 External Address Bus Bit 12 PC4 General Purpose I/O Port C Bit 4 |
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| 36 |
A13 External Address Bus Bit 13 PC5 General Purpose I/O Port C Bit 5 |
|
| 37 |
A14 External Address Bus Bit 14 PC6 General Purpose I/O Port C Bit 6 |
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| 38 |
A15 External Address Bus Bit 15 PC7 General Purpose I/O Port C Bit 7 |
|
| 39 |
PE0 General Purpose I/O Port E Bit 0 RXD0 UART 0 Receive Input PDI Programming Data Input |
UART0 receiver. Connected to RS-232 or RS-485 via JP1 pin 12. Also used for SPI programming on Ethernut 2.0. |
| 40 |
PE1 General Purpose I/O Port E Bit 1 TXD0 UART 0 Transmit Output PDO Programming Data Output |
UART0 transmitter. Connected to RS-232 or RS-485 via JP1 pin 2. Also used for SPI programming on Ethernut 2.0. |
| 41 |
PE2 General Purpose I/O Port E Bit 2 XCK0 USART 0 External Clock AIN0 Analog Comparator Positive Input |
Optionally used for UART handshake output via JP1 pin 6. |
| 42 |
PE3 General Purpose I/O Port E Bit 3 OC3A Counter 3 Compare and PWM A AIN1 Analog Comparator Positive Input |
Optionally used for UART handshake input via JP1 pin 5. |
| 43 |
PE4 General Purpose I/O Port E Bit 4 INT4 External Interrupt 4 OC3B Counter 3 Compare and PWM B |
Available. |
| 44 |
PE5 General Purpose I/O Port E Bit 5 INT5 External Interrupt 5 OC3C Counter 3 Compare and PWM C |
Internally used for Ethernet Controller Interrupt. Available when removing R2 and mounting R31. |
| 45 |
PE6 General Purpose I/O Port E Bit 6 INT6 External Interrupt 6 T3 Counter 3 Clock Input |
Available by default. Alternative Ethernet Interrupt when removing R2 and mounting R31. |
| 46 |
PE7 General Purpose I/O Port E Bit 7 INT7 External Interrupt 7 ICP3 Counter 3 Input Capture |
Optionally used for UART handshake output via JP1 pin 8. |
| 47 |
PB0 General Purpose I/O Port B Bit 0 -SS SPI Slave Select Input |
Available. |
| 48 |
PB1 General Purpose I/O Port B Bit 1 SCK SPI Bus Serial Clock |
Available for additional SPI devices. |
| 49 |
PB2 General Purpose I/O Port B Bit 2 MOSI SPI Bus Master Output / Slave Input |
|
| 50 |
PB3 General Purpose I/O Port B Bit 3 MISO SPI Bus Master Input / Slave Output |
|
| 51 |
PB4 General Purpose I/O Port B Bit 4 OC0 Counter 0 Compare and PWM |
Positive chip select for serial flash memory. 12kΩ pull down. |
| 52 |
PB5 General Purpose I/O Port B Bit 5 OC1A Counter 1 Compare and PWM A |
Available. |
| 53 |
PB6 General Purpose I/O Port B Bit 6 OC1B Counter 1 Compare and PWM B |
Available. |
| 54 |
PB7 General Purpose I/O Port B Bit 7 OC1C Counter 1 Compare and PWM C OC2 Counter 2 Compare and PWM |
Available. |
| 55 |
PD0 General Purpose I/O Port D Bit 0 INT0 External Interrupt 0 SCL TWI Serial Clock |
Available, recommended for external I2C devices. |
| 56 |
PD1 General Purpose I/O Port D Bit 1 INT1 External Interrupt 1 SDA TWI Serial Data |
Available, recommended for external I2C devices. |
| 57 |
PD2 General Purpose I/O Port D Bit 2 INT2 External Interrupt 2 RXD1 UART 1 Receive Input |
Connected to RS-232 or RS-485 via JP1 pin 9. |
| 58 |
PD3 General Purpose I/O Port D Bit 3 INT3 External Interrupt 3 TXD1 UART 1 Transmit Output |
Connected to RS-232 or RS-485 via JP1 pin 3. |
| 59 |
PD4 General Purpose I/O Port D Bit 4 ICP1 Counter 1 Input Capture |
Optionally used for RS-485 direction via JP2 pin 6. |
| 60 |
PD5 General Purpose I/O Port D Bit 5 XCK1 USART 1 External Clock |
Optionally used for RS-485 direction via JP2 pin 1. |
| 61 |
PD6 General Purpose I/O Port D Bit 6 T1 Counter 1 Clock Input |
Available. |
| 62 |
PD7 General Purpose I/O Port D Bit 7 T2 Counter 2 Clock Input |
Available. |
| 63 | N/C Not Connected | |
| 64 |
N/C if R34 not mounted ALE External Address Bus Latch Enable |
Analog Port
| Pin | Signal | Description |
|---|---|---|
| 1 | AVCC +5V Power Supply | Connected to digital power supply via FB2 |
| 2 | AREF Analog reference | Connected to CPU AREF pin. |
| 3 | AVCC +5V Power Supply | Connected to digital power supply via FB2 |
| 4 | AGND Analog ground | Connected to digital ground via R3. |
| 5 |
PF0 General Purpose I/O Port F Bit 0 ADC0 Analog/Digital Converter Channel 0 |
Available. |
| 6 | AGND Analog ground | Connected to digital ground via R3. |
| 7 |
PF1 General Purpose I/O Port F Bit 1 ADC1 Analog/Digital Converter Channel 1 |
Available. |
| 8 | AGND Analog ground | Connected to digital ground via R3. |
| 9 |
PF2 General Purpose I/O Port F Bit 2 ADC2 Analog/Digital Converter Channel 2 |
Available. |
| 10 | AGND Analog ground | Connected to digital ground via R3. |
| 11 |
PF3 General Purpose I/O Port F Bit 3 ADC3 Analog/Digital Converter Channel 3 |
Available. |
| 12 | AGND Analog ground | Connected to digital ground via R3. |
| 13 |
PF4 General Purpose I/O Port F Bit 4 ADC4 Analog/Digital Converter Channel 4 TCK JTAG |
Available, but used during JTAG programming/debugging. |
| 14 | AGND Analog ground | Connected to digital ground via R3. |
| 15 |
PF5 General Purpose I/O Port F Bit 5 ADC5 Analog/Digital Converter Channel 5 TMS JTAG |
Available, but used during JTAG programming/debugging. |
| 16 | AGND Analog ground | Connected to digital ground via R3. |
| 17 |
PF6 General Purpose I/O Port F Bit 6 ADC6 Analog/Digital Converter Channel 6 TDO JTAG |
Available, but used during JTAG programming/debugging. |
| 18 | AGND Analog ground | Connected to digital ground via R3. |
| 19 |
PF7 General Purpose I/O Port F Bit 7 ADC7 Analog/Digital Converter Channel 7 TDI JTAG |
Available, but used during JTAG programming/debugging. |
| 20 | AGND Analog ground | Connected to digital ground via R3. |