[I2C_总线协议](I2C_%E6%80%BB%E7%BA%BF%E5%8D%8F%E8%AE%AE.md) [PWM_脉宽调制](PWM_%E8%84%89%E5%AE%BD%E8%B0%83%E5%88%B6.md) [SPI_同步串行协议](SPI_%E5%90%8C%E6%AD%A5%E4%B8%B2%E8%A1%8C%E5%8D%8F%E8%AE%AE.md) [Timer_硬件定时器](Timer_%E7%A1%AC%E4%BB%B6%E5%AE%9A%E6%97%B6%E5%99%A8.md) [UART_异步串口](UART_%E5%BC%82%E6%AD%A5%E4%B8%B2%E5%8F%A3.md)