Mega 2560 Ports

Hardware
1

I used a Nano classic because it exposed A0-A7, of which I used A0-A6 to write 7 bits to the port simultaneously. Some of you might already see the issue. A6 and A7 do not work as digital outputs with the 328P. So far as I see there is no way to write 7 or 8 bits to a single port as a digital output on any port on the 328P.

To that end, I upgraded the project to a Mega 2560. Looking at the pin/port diagram for the Mega 2650, it looks like I can easily use Port F or Port K to write 7 or 8 bits as a digital output. Do I have that correct or is there a pitfall that I've missed?

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2

There are several more ports on the header at the bottom that are not listed in your diagram.

Here is a list I got from the pins_arduino.h file, sorted by port. All eight pins are available on ports A, B, C, F, K, and L.

//Port ** Arduino Pin Number ** pin designation
PA 0 ** 22 ** D22	
PA 1 ** 23 ** D23	
PA 2 ** 24 ** D24	
PA 3 ** 25 ** D25	
PA 4 ** 26 ** D26	
PA 5 ** 27 ** D27	
PA 6 ** 28 ** D28	
PA 7 ** 29 ** D29	

PB 0 ** 53 ** SPI_SS	
PB 1 ** 52 ** SPI_SCK	
PB 2 ** 51 ** SPI_MOSI	
PB 3 ** 50 ** SPI_MISO	
PB 4 ** 10 ** PWM10	
PB 5 ** 11 ** PWM11	
PB 6 ** 12 ** PWM12	
PB 7 ** 13 ** PWM13	

PC 0 ** 37 ** D37	
PC 1 ** 36 ** D36	
PC 2 ** 35 ** D35	
PC 3 ** 34 ** D34	
PC 4 ** 33 ** D33	
PC 5 ** 32 ** D32	
PC 6 ** 31 ** D31	
PC 7 ** 30 ** D30	

PD 0 ** 21 ** I2C_SCL	
PD 1 ** 20 ** I2C_SDA	
PD 2 ** 19 ** USART1_RX	
PD 3 ** 18 ** USART1_TX	
PD 7 ** 38 ** D38	

PE 0 ** 0 ** USART0_RX	
PE 1 ** 1 ** USART0_TX	
PE 3 ** 5 ** PWM5	
PE 4 ** 2 ** PWM2	
PE 5 ** 3 ** PWM3	

PF 0 ** 54 ** A0	
PF 1 ** 55 ** A1	
PF 2 ** 56 ** A2	
PF 3 ** 57 ** A3	
PF 4 ** 58 ** A4	
PF 5 ** 59 ** A5	
PF 6 ** 60 ** A6	
PF 7 ** 61 ** A7	

PG 0 ** 41 ** D41	
PG 1 ** 40 ** D40	
PG 2 ** 39 ** D39	
PG 5 ** 4 ** PWM4	

PH 0 ** 17 ** USART2_RX	
PH 1 ** 16 ** USART2_TX	
PH 3 ** 6 ** PWM6	
PH 4 ** 7 ** PWM7	
PH 5 ** 8 ** PWM8	
PH 6 ** 9 ** PWM9	

PJ 0 ** 15 ** USART3_RX	
PJ 1 ** 14 ** USART3_TX	

PK 0 ** 62 ** A8	
PK 1 ** 63 ** A9	
PK 2 ** 64 ** A10	
PK 3 ** 65 ** A11	
PK 4 ** 66 ** A12	
PK 5 ** 67 ** A13	
PK 6 ** 68 ** A14	
PK 7 ** 69 ** A15	

PL 0 ** 49 ** D49	
PL 1 ** 48 ** D48	
PL 2 ** 47 ** D47	
PL 3 ** 46 ** D46	
PL 4 ** 45 ** D45	
PL 5 ** 44 ** D44	
PL 6 ** 43 ** D43	
PL 7 ** 42 ** D42
1 Like
3

Works for me. Thanks for taking the time to answer.

Happy New Year!

4

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