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Explain in detail the operation of 8255 in mode1 taking suitable example.
In mode1, Ports A and B are programmed as input or output ports and Port C is used for handshaking.
8255 handshaking
PPI Interface to CPU
Port A and or port B treated as latching input devices. External data is stored into the ports till the microprocessor is ready.
Port C is utilized for control or handshaking signal that cannot for data.
Signal Definitions for Mode 1 Strobed Input.
STB‾: The strobe input loads data in port latch on a 0 to 1 transition,
IFB: Input buffer full is an output specifying that input latch has information.
INTR: Interrupt requests outputs which request an interrupt.
INTE: Interrupt enable signal is neither output nor an input; this is an internal bit programmed through the PC4 that is port A to PC2 that is port B bits.
PC7, PC6: The port C pins 7 and 6 both are general purpose I/O pins which are available for any reasons.
How the interrupts can be masked/unmasked in 8086? The 8086 interrupt priorities are concerned; software interrupts have the highest priority, followed by NMI followed by INTR.
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tension and sag problems
Register Addressing In this mode the operand are microprocessors registers only i, e the operations is performed within various registers of the microprocessors only.
3-phase 3 wire meter with CT and MD It is exactly such as 3-phase 4 wire meter and works on the similar principle. It is also used in the similar way and under the similar cir
please explain phasor diagram and equivalent circuit
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