The following functional pin mapping is used by the sduino MB board.
| MEGA/MB pin | STM8S208MBT6B pin | ATmega2560-16AU pin |
|---|---|---|
| 0 RX0 | 10 PA4 (HS)/UART1_RX | 2 PE0/RXD0/PCINT8 |
| 1 TX0 | 11 PA5 (HS)/UART1_TX | 3 PE1/TXD0 |
| 2 | 36 PH5/TIM1_CH3N | 6 PE4/OC3B/INT4 |
| 3 | 37 PH6/TIM1_CH2N | 7 PE5/OC3C/INT5 |
| 4 | 9 PA3/TIM2_CH3 [TIM3_CH1] | 1 PG5/OC0B |
| 5 | 38 PH7/TIM1_CH1N | 5 PE3/OC3A/AIN1 |
| 6 | 73 PD0 (HS)/TIM3_CH2 [TIM1_BKIN]/[CLK_CCO] | 15 PH3/OC4A |
| 7 | 75 PD2 (HS)/TIM3_CH1 [TIM2_CH3] | 16 PH4/OC4B |
| 8 | 76 PD3 (HS)/TIM2_CH2 [ADC_ETR] | 17 PH5/OC4C |
| 9 | 77 PD4 (HS)/TIM2_CH1 [BEEP] | 18 PH6/OC2B |
| 10 | 43 PC1 (HS)/TIM1_CH1 | 23 PB4/OC2A/PCINT4 |
| 11 | 44 PC2 (HS)/TIM1_CH2 | 24 PB5/OC1A/PCINT5 |
| 12 | 45 PC3 (HS)/TIM1_CH3 | 25 PB6/OC1B/PCINT6 |
| 13 | 46 PC4 (HS)/TIM1_CH4 | 26 PB7/OC1C/PCINT7 |
| 14 TX3 | 78 PD5/UART3_TX | 64 PJ1/TXD3/PCINT10 |
| 15 RX3 | 79 PD6/UART3_RX | 63 PJ0/RXD3/PCINT9 |
| 16 TX2/CTX | 52 PG0/CAN_TX | 13 PH1/TXD2 |
| 17 RX2/CRX | 53 PG1/CAN_RX | 12 PH0/RXD2 |
| 18¹ TX1 | — | 46 PD3/TXD1/INT3 |
| 19¹ RX1 | — | 45 PD2/RXD1/INT2 |
| 20 SDA | 68 PE2 (T)/I2C_SDA | 44 PD1/SDA/INT1 |
| 21 SCL | 69 PE1 (T)/I2C_SCL | 43 PD0/SCL/INT0 |
| 22 | 57 PI0 | 78 PA0/AD0 |
| 23 | 58 PI1 | 77 PA1/AD1 |
| 24 | 59 PI2 | 76 PA2/AD2 |
| 25 | 60 PI3 | 75 PA3/AD3 |
| 26 | 61 PI4 | 74 PA4/AD4 |
| 27 | 62 PI5 | 73 PA5/AD5 |
| 28 | 71 PI6 | 72 PA6/AD6 |
| 29 | 72 PI7 | 71 PA7/AD7 |
| 30 | 65 PG7 | 60 PC7/A15 |
| 31 | 64 PG6 | 59 PC6/A14 |
| 32 | 63 PG5 | 58 PC5/A13 |
| 33 | 56 PG4 | 57 PC4/A12 |
| 34 | 55 PG3 | 56 PC3/A11 |
| 35 | 54 PG2 | 55 PC2/A10 |
| 36 | 74 PD1 (HS)/SWIM | 54 PC1/A9 |
| 37 | 80 PD7 /TLI | 53 PC0/A8 |
| 38 | 42 PC0/ADC_ETR | 50 PD7/T0 |
| 39 | 66 PE4 | 70 PG2/ALE |
| 40 | 67 PE3/TIM_BKIN | 52 PG1/RD |
| 41 | 70 PE0 (HS)/CLK_CCO | 51 PG0/WR |
| 42 | 12 PA6 (HS)/UART1_CK | 42 PL7 |
| 43 | 35 PH4/TIM1_ETR | 41 PL6 |
| 44 | 16 PH3 | 40 PL5/OC5C |
| 45 | 15 PH2 | 39 PL4/OC5B |
| 46 | 14 PH1 (HS) | 38 PL3/OC5A |
| 47 | 13 PH0 (HS) | 37 PL2/T5 |
| 48² | — | 36 PL1/ICP5 |
| 49² | — | 35 PL0/ICP4 |
| 50 | 51 PC7 (HS)/SPI_MISO | 22 PB3/MISO/PCINT3 |
| 51 | 50 PC6 (HS)/SPI_MOSI | 21 PB2/MOSI/PCINT2 |
| 52 | 47 PC5 (HS)/SPI_SCK | 20 PB1/SCK/PCINT1 |
| 53 | 41 PE5/SPI_NSS | 19 PB0/SS/PCINT0 |
| 54 A0 | 34 PB0/AIN0 [TIM1_CH1N] | 97 PF0/ADC0 |
| 55 A1 | 33 PB1/AIN1 [TIM1_CH2N] | 96 PF1/ADC1 |
| 56 A2 | 32 PB2/AIN2 [TIM1_CH3N] | 95 PF2/ADC2 |
| 57 A3 | 31 PB3/AIN3 [TIM1_ETR] | 94 PF3/ADC3 |
| 58 A4 | 29 PB5/AIN5 [I2C_SDA] | 93 PF4/ADC4/TCK |
| 59 A5 | 30 PB4/AIN4 [I2C_SCL] | 92 PF5/ADC5/TMS |
| 60 A6 | 28 PB6/AIN6 | 91 PF6/ADC6/TDO |
| 61 A7 | 27 PB7/AIN7 | 90 PF7/ADC7/TDI |
| 62 A8 | 39 PE7/AIN8 | 89 PK0/ADC8/PCINT16 |
| 63 A9 | 40 PE6/AIN9 | 88 PK1/ADC9/PCINT17 |
| 64 A10 | 26 PF0/AIN10 | 87 PK2/ADC10/PCINT18 |
| 65 A11 | 21 PF3/AIN11 | 86 PK3/ADC11/PCINT19 |
| 66 A12 | 20 PF4/AIN12 | 85 PK4/ADC12/PCINT20 |
| 67 A13 | 19 PF5/AIN13 | 84 PK5/ADC13/PCINT21 |
| 68 A14 | 18 PF6/AIN14 | 83 PK6/ADC14/PCINT22 |
| 69 A15 | 17 PF7/AIN15 | 82 PK7/ADC15/PCINT23 |
- not available on sduino MB; physical location connects to A4 and A5
- not available on sduino MB; physical location connects to AR+ and AR-