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BSR Mode (BSR Command) is only applicable for Port C. In this Mode the individual bits of Port C can be set or reset. This is very useful as it. The BSR mode is a port C bit set/reset mode. The individual bit of port C can be set or reset by writing control word in the control register. The control word format . Control Word and BSR Mode Format. Page 2. The figure shows the control word format in the input/output mode. This mode is Filectrlformat

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Intel 8255

In our lab, when I had not not set port C as output and directly used BSR mode to set and reset individual bits, only the 4 led’s connected to the lower four bits of port C were responding. This is an active low output signal generated by The bit set using BSR mode remains set unless and until you change the bit. All of these chips were originally available in a pin DIL package. Only port A can be initialized in this mode. As shown in figure, the transfer of data is achieved by port C handshake signals.

What are the basic modes of operation ofExplain with the format of control register.

Popular Posts Storage Management Phases. The individual bit of Port C can be set or reset by writing control word in the control register. The Mode 2 is combination of Mode 1 input output both at a time to port A.


The bi-directional data is transferred through port A so it consists of input and output latch. When we wish to use port A or port B for handshake strobed input or output operation, we initialise that port in mode 1 port A and port B can be initilalised to operate in different modes, i. Engineering in your pocket Download our mobile app and study on-the-go.

Working of in mode 2: If port C is not set in output mode and we write a BSR instruction to the control register, will the write fail?

What are the basic modes of operation of , Explain with the format of control register.

Ranjith 1 5. The internal organization of these signals, which is shown in figure 2. Download our mobile app and study on-the-go.

Since the two halves of port C are independent, they may be used such that one-half is initialized as an input port while the other half is initialized as an output port. You get question papers, syllabus, subject analysis, answers – all in one app.

When CPU write data to output port will enable OBF signal to indicate peripheral that data is available in output buffer. All the 3 modes i. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. This page was last edited on 23 Septemberat In simpler terms is a way to allocate memory to a program when program calls for it and deal When we are setting and resetting certain bits in port C, shouldn’t port C automatically be taken as an output port?


The is a member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1].

Using BSR Mode of with – Electrical Engineering Stack Exchange

Function of each bit is as follows: Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:. Home Questions Tags Users Unanswered.

The two modes are selected on the basis of the value present at the D 7 bit of the control word register. Mode 0 and Mode 1 for port B and port C lower.

Post as a guest Name. It is an act of managing computer memory. The BSR mode affects only one bit of port C at a time.

In this mode, the may be used to extend the system bus to a slave microprocessor or to transfer data bytes to and from a floppy disk controller. The Mkde or i Programmable Peripheral Interface PPI chip was developed and manufactured by Intel in the first half of the s for the Intel microprocessor.