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Ethernut 1 Ports

Expansion Port


Pin Signal Description
1 N/C Not Connected Reserved for alternative supply
2 N/C Not Connected Reserved for alternative supply
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
as 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  
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
 
24 A1 External Address Bus Bit 1
PA1 General Purpose I/O Port A Bit 1
 
25 A2 External Address Bus Bit 2
PA2 General Purpose I/O Port A Bit 2
 
26 A3 External Address Bus Bit 3
PA3 General Purpose I/O Port A Bit 3
 
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
 
30 A7 External Address Bus Bit 7
PA7 General Purpose I/O Port A Bit 7
 
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
 
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
 
35 A12 External Address Bus Bit 12
PC4 General Purpose I/O Port C Bit 4
 
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
 
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 level converter output via R18.
Also used for SPI programming.
40 PE1 General Purpose I/O Port E Bit 1
TXD0 UART 0 Transmit Output
PDO Programming Data Output
UART0 transmitter.
Also used for SPI programming.
41 PE2 General Purpose I/O Port E Bit 2
XCK0 USART 0 External Clock
AIN0 Analog Comparator Positive Input
Available.
42 PE3 General Purpose I/O Port E Bit 3
OC3A Counter 3 Compare and PWM A
AIN1 Analog Comparator Positive Input
Available.
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 R12 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 R12 and mounting R31.
46 PE7 General Purpose I/O Port E Bit 7
INT7 External Interrupt 7
ICP3 Counter 3 Input Capture
Available.
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, but used during SPI programming.
If used as Ethernut input, the external output
must be switched to tri-state during SPI
programming (MR\ low),
49 PB2 General Purpose I/O Port B Bit 2
MOSI SPI Bus Master Output / Slave Input
Available.
50 PB3 General Purpose I/O Port B Bit 3
MISO SPI Bus Master Input / Slave Output
Available.
51 PB4 General Purpose I/O Port B Bit 4
OC0 Counter 0 Compare and PWM
Available.
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.
56 PD1 General Purpose I/O Port D Bit 1
INT1 External Interrupt 1
SDA TWI Serial Data
Available.
57 PD2 General Purpose I/O Port D Bit 2
INT2 External Interrupt 2
RXD1 UART 1 Receive Input
Available by default.
Optional CTS input when R33 is mounted.
58 PD3 General Purpose I/O Port D Bit 3
INT3 External Interrupt 3
TXD1 UART 1 Transmit Output
Available by default.
Optional RTS output when R32 is mounted.
59 PD4 General Purpose I/O Port D Bit 4
ICP1 Counter 1 Input Capture
Available.
60 PD5 General Purpose I/O Port D Bit 5
XCK1 USART 1 External Clock
Available.
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 R13
2 AREF Analog reference Connected to CPU AREF pin.
3 AVCC +5V Power Supply Connected to digital power supply via R13
4 AGND Analog ground Connected to digital ground via R15.
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 R15.
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 R15.
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 R15.
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 R15.
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 R15.
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 R15.
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 R15.
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 R15.