| 前言 |
| 学习修改Arduino原理图的时候读不懂引脚图。现写文如下滤清引脚关系。 |
ArduinoMega2560采用的是ATMEGA2560-16AU芯片。芯片内部有自己对引脚的一套编号，从1开始也就是PG5引脚。而Arduino板子对芯片引脚编号进行了重排，也就是映射，分为Digital跟Analog两种类型。Digital从0开始也就是PE0，Analog从0开始也就是PF0。
引脚表
| 映射引脚号Digital) |
芯片引脚名 |
引脚功能 |
| 0 |
PE0 |
RXD0 / PCINT8 |
| 1 |
PE1 |
TXD0 |
| 2 |
PE4 |
OC3B / INT4 |
| 3 |
PE5 |
OC3C / INT5 |
| 4 |
PG5 |
OC0B |
| 5 |
PE3 |
OC3A / AIN1 |
| 6 |
PH3 |
OC4A |
| 7 |
PH4 |
OC4B |
| 8 |
PH5 |
OC4C |
| 9 |
PH6 |
OC2B |
| 10 |
PB4 |
OC2A / PCINT4 |
| 11 |
PB5 |
OC1A / PCINT5 |
| 12 |
PB6 |
OC1B / PCINT6 |
| 13 |
PB7 |
OC0A / OC1C/PCINT7 |
| 14 |
PJ1 |
TXD3 / PCINT10 |
| 15 |
PJ0 |
RXD3 / PCINT9 |
| 16 |
PH1 |
TXD2 |
| 17 |
PH0 |
RXD2 |
| 18 |
PD3 |
TXD1 / INT3 |
| 19 |
PD2 |
RXD1 / INT2 |
| 20 |
PD1 |
SDA / INT1 |
| 21 |
PD0 |
SCL / INT0 |
| 22 |
PA0 |
AD0 |
| 23 |
PA1 |
AD1 |
| 24 |
PA2 |
AD2 |
| 25 |
PA3 |
AD3 |
| 26 |
PA4 |
AD4 |
| 27 |
PA5 |
AD5 |
| 28 |
PA6 |
AD6 |
| 29 |
PA7 |
AD7 |
| 30 |
PC7 |
A15 |
| 31 |
PC6 |
A14 |
| 32 |
PC5 |
A13 |
| 33 |
PC4 |
A12 |
| 34 |
PC3 |
A11 |
| 35 |
PC2 |
A10 |
| 36 |
PC1 |
A9 |
| 37 |
PC0 |
A8 |
| 38 |
PD7 |
T0 |
| 39 |
PG2 |
ALE |
| 40 |
PG1 |
RD |
| 41 |
PG0 |
WR |
| 42 |
PL7 |
|
| 43 |
PL6 |
|
| 44 |
PL5 |
OC5C |
| 45 |
PL4 |
OC5B |
| 46 |
PL3 |
OC5A |
| 47 |
PL2 |
T5 |
| 48 |
PL1 |
ICP5 |
| 49 |
PL0 |
ICP4 |
| 50 |
PB3 |
MISO / PCINT3 |
| 51 |
PB2 |
MOSI / PCINT2 |
| 52 |
PB1 |
SCK / PCINT1 |
| 53 |
PB0 |
SS / PCINT0 |
| 映射引脚号Analog) |
芯片引脚名 |
引脚功能 |
| 0 |
PF0 |
ADC0 |
| 1 |
PF1 |
ADC1 |
| 2 |
PF2 |
ADC2 |
| 3 |
PF3 |
ADC3 |
| 4 |
PF4 |
ADC4 / TCK |
| 5 |
PF5 |
ADC5 / TMS |
| 6 |
PF6 |
ADC6 / TDO |
| 7 |
PF7 |
ADC7 / TDI |
| 8 |
PK0 |
ADC8 / PCINT16 |
| 9 |
PK1 |
ADC9 / PCINT17 |
| 10 |
PK2 |
ADC10 / PCINT18 |
| 11 |
PK3 |
ADC11 / PCINT19 |
| 12 |
PK4 |
ADC12 / PCINT20 |
| 13 |
PK5 |
ADC13 / PCINT21 |
| 14 |
PK6 |
ADC14 / PCINT22 |
| 15 |
PK7 |
ADC15 / PCINT23 |
PWM引脚
说明：Digital引脚带有OC功能的为PWM引脚
| 映射引脚号Digital) |
芯片引脚名 |
引脚功能 |
| 2 |
PE4 |
OC3B / INT4 |
| 3 |
PE5 |
OC3C / INT5 |
| 4 |
PG5 |
OC0B |
| 5 |
PE3 |
OC3A / AIN1 |
| 6 |
PH3 |
OC4A |
| 7 |
PH4 |
OC4B |
| 8 |
PH5 |
OC4C |
| 9 |
PH6 |
OC2B |
| 10 |
PB4 |
OC2A / PCINT4 |
| 11 |
PB5 |
OC1A / PCINT5 |
| 12 |
PB6 |
OC1B / PCINT6 |
| 13 |
PB7 |
OC0A / OC1C/PCINT7 |
| 44 |
PL5 |
OC5C |
| 45 |
PL4 |
OC5B |
| 46 |
PL3 |
OC5A |
串口引脚
| 串口号 |
TXD |
RXD |
| UART 0 |
Digital Pin 1 |
Digital Pin 0 |
| UART 1 |
Digital Pin 18 |
Digital Pin 19 |
| UART 2 |
Digital Pin 16 |
Digital Pin 17 |
| UART 3 |
Digital Pin 14 |
Digital Pin 15 |
外部中断引脚
| 芯片中断号 |
映射引脚号Digital) |
Arduino中断号 |
| INT0 |
21 |
int.2 |
| INT1 |
20 |
int.3 |
| INT2 |
19 |
int.4 |
| INT3 |
18 |
int.5 |
| INT4 |
2 |
int.0 |
| INT5 |
3 |
int.1 |
引脚图
