5.2 ILLUSTRATIVE EXAMPLE 1: INTERFACING LEDS In this section, we will analyze an actual interfacing circuit with the port address 07H to display binary data at an LED port and a single digit at a seven-segment LED. A group of 8 LEDs will be used to indicate binary I s and Os and will be’ […]
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Interfacing I/O Devices
Basic Concepts in Interfacing Output Devices
5.1.3 Basic Concepts in Interfacing Output Devices The concepts in interfacing output devices are similar to those in interfacing memory. The steps can be listed as follows: 1. Decode the low-order address bus to generate a unique pulse corresponding to the port address on the bus; this is called the I/O address (I͞O͞A͞D͞R͞) pulse. 2. […]
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Interfacing I/O Devices
Interfacing I/O Devices The I/O (Input/Output) is the third component of a microprocessor-based system. I/O devices, such as keyboards and displays, are the ears and eyes of the MPUs; they are the communication channels to the "outside world." Data can enter or exit in groups of eight bits using the entire data bus; this is […]
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