Test: Parallel Ports

Explanation: The parallel port can transfer multiple bits of data simultaneously. It provides the input or output binary data with a single bit allocated to each pin within the port.

Explanation: The LEDs, alphanumeric displays, seven segment displays are interfaced for the output whereas the switch is an input port.

Explanation: The keyboards, switches, and knobs are used as output whereas the LEDs are used as the input port.

Explanation: The basic operation of the parallel port dealt with two types of registers which are called data direction register and the data register.

Explanation: The progression in the parallel ports provides a third register or an individual control bit which can make the pin in a high impedance state. An output port which can do this is also known as tri-state, that is, logic high, logic low and a high impedance state.

Explanation: The implementation of parallel port uses a couple of buffers which are enabled by the data direction register by setting the corresponding bit of the register.

Explanation: The register which offers high impedance is the individual control bit or the third register which can be implemented by switching off both the buffers and putting their connections to the pin which offers high impedance.

Explanation: The multifunction I/O port can also be used a chip select for the memory design. The function that the pin performs is set up internally through the use of a function register which internally configures how the external pins are connected internally.

Explanation: The I/O port needs an external pull-up resistor. In some devices, it offers internally. If it is not provided, it can cause incorrect data on reading the port and it prevents the port from turning off an external device.

Explanation: The multifunction I/O ports can be described as the general-purpose and it can be shared with other peripherals.