Microprocessor

USART 8251 microprocessor

by

Here I will discus with you about USART 5251 microprocessor, it is also know as programable communication interface intel 8251 and USART stands for Universal Synchronous/Asynchronous Receive/transmitter. Programmable communication interface is use for serial data transmission, The I.C. chip is fabricated using N-channel silicon gate technology. The 8251 can be use to transmit or receive … Read more

Block diagram of 8253 and Pin diagram of 8253

by

In this article we are discus about the functional block diagram and pin description of 8253 or 8254 (PIT) Programmable Interval Timer. The 8253 is a programmable universal timer design for use in microcomputer system. Hence it uses N-MOS technology with +5 volt supply and it has 24 pin. Below you can see the block … Read more

8085 pin diagram – Address bus and data bus – 8085.

by

So today we will discuss about the pins of 8085 microprocessor. It is an 8 bit microprocessor make by N-MOS technology, It has 40 pins and 256 number of opcodes. So let’s see 8085 pin diagram. The picture shows a schematic diagram of intel 8085.The details of various pins are given below. So in this … Read more

Intel 8255 programmable peripheral interface.

by

Here we are going to talk about Intel 8255 programmable peripheral interface (PPI). It is a multiport peripheral device, Its main function is to interfacing external microcomputer. And it has three 8-bit ports and that is (i) Port A (ii) Port B (iii) Port C. The port ‘C’ has been further divide into 2 parts, … Read more