What are parallel ports?
(1) A hardware interface that transfers one or more bytes simultaneously. See parallel interface. (2) A socket on a computer used to connect a printer or other device via a parallel interface (eight data bits transferring simultaneously).
What is Gpio in microcontroller?
A General Purpose Input/output (GPIO) is an interface available on most modern microcontrollers (MCU) to provide an ease of access to the devices internal properties. The pins can be programmed as input, where data from some external source is being fed into the system to be manipulated at a desired time and location.
What are microcontroller ports?
Ports are represented by registers inside the microcontroller, and allow the program (firmware) to control the state of the pins, or conversely, read the state of the pins if they are configured as inputs. There is a one-to-one correspondence between the pins on the microcontroller and the bits in its registers.
What is the function of a parallel ports?
A parallel port is an interface allowing a personal computer (PC) to transmit or receive data down multiple bundled cables to a peripheral device such as a printer. The most common parallel port is a printer port known as the Centronics port.
Where are parallel ports used?
Parallel ports provide an interface to connect multiple lines to prepare a parallel communication to send large data at a time. Parallel ports are used in connecting printers, hard-drives, CD-drives etc. All lines speed should be same to avoid error and cross-talk issues.
How are two parallel I / O ports used in a microcontroller?
There are two buses used for I/O. The digital I/O ports are connected to both the advanced peripheral bus and the advanced high-performance bus. Because of the multiple buses, the microcontroller can perform I/O bus cycles simultaneous with instruction fetches from flash ROM.
Why do we need parallel ports for GPIO?
Our first input/output interfaces will use the parallel ports or GPIO, allowing us to exchange digital information with the external world. From the very beginning of a project, we must consider how the system will be tested. In this chapter we present some debugging techniques that will be very useful for verifying proper operation of our system.
Which is an example of a parallel port?
For example, port pins PA1 and PA0 can be either regular parallel port pins or an asynchronous serial port called universal asynchronous receiver/transmitter (UART). The ability to manage time, as an input measurement and an output parameter, has made a significant impact on the market share growth of microcontrollers.
What kind of pins are used for parallel ports?
Most pins, however, have an alternative function. For example, port pins PA1 and PA0 can be either regular parallel port pins or an asynchronous serial port called universal asynchronous receiver/transmitter (UART).