Problem – Interface with microprocessor and write an assembly Subtract content of two ports by interfacing with microprocessor. The interfacing happens with the ports of the Microprocessor. The main IC’s which are to be interfaced with are: 1. PPI. 2. PIC. 3. USART. PPI: 82C55 The 82C55 is a popular interfacing component, that can interface any TTL-compatible I/O device to the microprocessor.

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To roll above message we have to load 7-segment wit for characters within the message and it is necessary to configure in right entry mode. About Me Dhanoop Bhaskar.

These devices are nothing but a combination of many devices on a single chip.

Microprocessors engineering – Interfacing the 8085 microprocessor

Send data on PB to glow G3 and G4. The register values are chosen in Fig. Assume address of control word register of as 83H.


Initial size in write Display. Debugging a Program in Actual pin connections are listed in Table 1 below.

Memory mapped I/O interfacing with microprocessor – Electronics Engineering Study Center

Send data on port B to glow R3 and R4. Get the 7 segment code. Get the Excite code. Write a program to interfading Port C bit 0 of the Write a program to initialize in the configuration given below: The control word format of according to hardware connections is: Interrupt Structure of Design a microprocessor system to control traffic lights.

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For example for carrying out a READ process, the microprocessor should initiate a read signal which the memory requires to read a data. So there is chance of interfacinf and defects. Write an assembly language program to roll message ‘HELL’ from right to left. Send data on port A to glow G1 and G2. Thus the capability is very limited in this type of interfacing.

External clock frequency is 3 MHz. So we are using a keyboard and monitor as Input and output along with the processor.


8255A – Programmable Peripheral Interface

Input Output Interfacing Techniques. Other blogs of mine: Maximum Mode Configuration of It functions as an input device if it is connected to buffer and as an output device if it is connected to latch.

This interface gets a byte of data from microprocessor and ingerfacing it bit by bit to the other systems in simultaneous or parallel fashion.

For this purpose an address decoding circuit is used. The three steps needed to write the software are: Check if multiplier zero, otherwise repeat. Jump back to read status. Read FIFO status word. Supporting 82555 of Microprocessor.