The Arduino Classroom Arduino 101 - Chapter 11: Sound

摘要

Microcontrollers - like the Atmel ATmega328 used in the Arduino UNO - are made of several internal sections on an IC (Integrated Circuit) that work together to provide intelligence, communications, sensing, and control. The intelligence is provided by the CPU (Central Processing Unit): a section that runs (processes) the code you write one step at a time. Peripheral devices do the communications, sensing, and control. These are sections on the IC that can do things independent of the CPU. For example, the Arduino serial communications use a UART peripheral device to communicate with a PC. The CPU loads a byte of data into the UART and tells it to send the byte. The UART then - with no further help from the CPU - sends each of the eight bits of the byte, one at a time to the PC.