Before revision: Special Microcontroller Functions, retrieved 29 October 2011 Specialized functions can include: Hardware interrupts, analog input or output PWM output Serial communication, such as UART, USART, SPI bus, or SerDes.
After revision: Specialized functions can include: Hardware interrupts, analog input or output PWM output Serial communication, such as UART, USART, SPI bus, or SerDes.