Editando C6 - Microcontroller Ports (sección)

= C6.0 - Introduction =
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I/O pins configuration: los pines de un microcontrolador pueden tener varias funciones
*Parallel I/O
*Alternative functions
**UART (Universal asyncronous reciever/transmietter) - The UART can be used for serial communication between computers. It is asynchronous and allows for simultaneous communication in both directions.
**SSI (Synchronous serial interface) - The SSI is alternately called serial peripheral interface (SPI). It is used to interface medium-speed I/O devices. In this book, we will use it to interface a graphics display. We could use SSI to interface a digital to analog converter (DAC) or a secure digital card (SDC).
**I2C (Inter-integrated circuit) -  I2C is a simple I/O bus that we will use to interface low speed peripheral devices.
**Timer (Periodic interrupts, input capture, and output compare) - Input capture and output compare will be used to create periodic interrupts and measure period, pulse width, phase, and frequency.
**PWM (Pulse width modulation) - PWM outputs will be used to apply variable power to motor interfaces. In a typical motor controller, input capture measures rotational speed, and PWM controls power. A PWM output can also be used to create a DAC.
**ADC (Analog to digital converter, measure analog signals) - The ADC will be used to measure the amplitude of analog signals and will be important in data acquisition systems. 
**Analog comparator (Compare two analog signals) - The analog comparator takes two analog inputs and produces a digital output depending on which analog input is greater.
**QEI (Quadrature encoder interface) - The QEI can be used to interface a brushless DC motor.
**USB (Universal serial bus) - USB is a high-speed serial communication channel.
**Ethernet (High-speed network) - The Ethernet port can be used to bridge the microcontroller to the Internet or a local area network.
**CAN (Controller area network) - The CAN creates a high-speed communication channel between microcontrollers and is commonly found in automotive and other distributed control applications.
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