Programmable Peripheral Interface (PPI) - 8255
Subject and UNIT: Microprocessors and Microcontrollers: Unit IV: (a) Programmable Peripheral Interface (PPI) - 8255
he ports of the 8255 can then be programmed for any other mode by writing a single control word into the control register, when required.
rogrammable Peripheral Interface (PPI) - 8255
Subject and UNIT: Microprocessors and Microcontrollers: Unit IV: (a) Programmable Peripheral Interface (PPI) - 8255
1. Bit Set-Reset (BSR) Mode 2. I/O Modes
Programmable Peripheral Interface (PPI) - 8255
Subject and UNIT: Microprocessors and Microcontrollers: Unit IV: (a) Programmable Peripheral Interface (PPI) - 8255
Fig. 8.3.1 shows the internal block diagram of 8255A. It consists of data bus buffer, control logic and Group A and Group B controls.
Subject and UNIT: Microprocessors and Microcontrollers: Unit IV: (a) Programmable Peripheral Interface (PPI) - 8255
Review Question : 1. Explain the use of important signals of 8255.
Features
Subject and UNIT: Microprocessors and Microcontrollers: Unit IV: (a) Programmable Peripheral Interface (PPI) - 8255
It can be programmed to transfer data under various conditions, from simple I/O to interrupt I/O
Subject and UNIT: Microprocessors and Microcontrollers: Unit I: (e) I/O Interfacing
Microprocessors and Microcontrollers: Unit I: (e) I/O Interfacing : Two Marks Questions with Answers, University Questions with Answers (Long Answered Questions)
Subject and UNIT: Microprocessors and Microcontrollers: Unit I: (e) I/O Interfacing
Review Question : 1. With necessary diagrams, explain the different data transfer schemes in 8085.
Subject and UNIT: Microprocessors and Microcontrollers: Unit I: (e) I/O Interfacing
The most of the microprocessors support isolated I/O system. It partitions memory from I/O, via software, by having instructions that specifically access (address) memory, and others that specifically access I/O.
Subject and UNIT: Microprocessors and Microcontrollers: Unit I: (e) I/O Interfacing
Review Question : 1. What do you mean by input port and output port ?
Memory Interfacing | Microprocessors and Microcontrollers
Subject and UNIT: Microprocessors and Microcontrollers: Unit I: (d) Memory Interfacing
Microprocessors and Microcontrollers: Unit I: (d) Memory Interfacing : University Questions with Answers (Long Answered Questions)
Memory Interfacing | Microprocessors and Microcontrollers
Subject and UNIT: Microprocessors and Microcontrollers: Unit I: (d) Memory Interfacing
Microprocessors and Microcontrollers: Unit I: (d) Memory Interfacing : Two Marks Questions with Answers
Memory Interfacing
Subject and UNIT: Microprocessors and Microcontrollers: Unit I: (d) Memory Interfacing
For interfacing memory devices to microprocessor 8085, following important points are to be kept in mind.