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what is the use of modem control unit in 8251the modem control unit handles the modem handshake signals to coordinate the communication among the
what are the modes used in display modes1 left entry modein the left entry mode the data is going into from the left side of the display unit2 right
what are the modes used in keyboard modes1 scanned keyboard mode with 2 key lockout2 scanned keyboard particular error mode3 scanned keyboard with
what is the output modes used in 82798279 gives two output modes for selecting the display options1display scanin this mode 8279 gives 8 or 16
give the operating modes of 8259aa automatic rotationb end of interrupt eoic fully nested mode d automatic eoi modee specific rotationf edge and
what are the different types of write operations used in 8253there are two types of write operations in 82531 writing a control word register2
what are the modes of operations used in 8253each of the three counters of 8253 can be operated in one of the following six modes of operation1 mode
what are the features used mode 2 in 8255the single 8-bit port in-group a is available1 the 8-bit port is bi-directional and additionally a 5-bit
what are the signals used in input control signal amp output control signalinput control signalstb strobe inputibf input buffer fullintrinterrupt
what are the features used mode 1 in 8255two groups - group a and group b are available for stored data transfer1 each group have one 8-bit data io
what are the basic modes of operation of 8255there are two basic modes of operation of 8255 viz1 io mode3 bsr modein io mode the 8255 ports work as
what are the functional types used in control words of 8251athe control words of 8251a are divided into two functional types1 mode instruction
what is asynchronous data transferit is a data transfer method which is used when the speed of an io device does not match with the speed of the
what is synchronous data transferit is a data method which is used when the io device and the microprocessor match in speed to transfer a data to or
what are the different types of methods used for data transmissionthe data transmission among two points involves unidirectional or bi-directional
what are cu and neu in 8087cu-control unitneu- numeric extension unit the numeric extension unit implements all the numeric processor instructions
explain numeric processor 8087numeric processor 8087 is a coprocessor which has been intended to work under the control of the processor 8086 and
what is meant by pollingin polling schemes a set of address lines is driven by the controller to address every of the masters in sequence when a bus
what is independent bus request schemeeach of the masters needs a pair of request and grant pins which are connected to the controlling logic the
what is meant by daisy chaining method it does not need any priority resolving network rather the priorities of all the devices are effectively
write some disadvantages of loosely coupled systemsmore complicated due to the needed additional communication hardwarethey are less portable and
what are loosely coupled systemsin loosely coupled systems every cpu may have its own bus control logic the bus arbitration is handled by an external
what are tightly coupled systems or closely coupled systemsin a tightly coupled systems the microprocessor either coprocessor or independent
what are proceduresprocedures are a group of instructions stored as a separate program in memory and it is known from the main program whenever
what are macrosmacro is a group of instruction the macro assembler makes the code in the program each time where the macro is called macros are