Category: Microprocessor

control word format for 8255A 0

CONTROL WORD FORMAT FOR 8255A

Here we will see the control word format for 8255A PPI IC. We already discussed in my previous post about “Programmable Peripheral Interface (PPI) IC 8255” and “OPERATIONAL MODES OF 8255 PPI IC”. Now...

operational modes of 8255 PPI IC 0

OPERATIONAL MODES OF 8255 PPI IC

Here we come with a new topic operational modes of 8255 PPI IC. In my previous post I discussed on details of “Programmable Peripheral Interface (PPI) IC 8255”. Now here we see how we...

direct memory access data transfer 0

Direct Memory Access (DMA) Data Transfer

Here we come with the discussion on direct memory access data transfer. In my early post I discussed on the topic “Programmed I/O Data Transfer scheme of 8085 microprocessor” and “Interrupt Driven I/O Data...

interrupt driven I/O data transfer 0

Interrupt Driven I/O Data Transfer

Here we see how interrupt driven I/O data transfer work. In my previous post I discussed on programmed I/O data transfer method. And we saw that in the programmed I/O data transfer method, microprocessor...

Data transfer schemes of 8085 microprocessor 0

Data transfer schemes of 8085 microprocessor

Here we can see data transfer schemes of 8085 microprocessor. In 8085 microprocessor based systems several input and output devices are connected. We know that data transfer may take place between microprocessor and memory,...

Peripheral mapped I/O interfacing 0

Peripheral mapped I/O interfacing

In peripheral mapped I/O interfacing, the I/O devices are treated differently from memory chips. In this method the control signals I/O read ( IOR ) and I/O write ( IOW), which are derived from...