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What are the features used mode 1 in 8255?
Two groups - group A and group B are available for stored data transfer.
1. Each group have one 8-bit data I/O port and one 4-bit control/data port.
2. The 8-bit data port can be either used as input or output port. The inputs and outputs both are latched.
3. Out of 8-bit port C, PC0-PC2 is used to produce control signals for port B and PC3=PC5 are used to produce control signals for port A. The lines PC6, PC7 may be used as independent data lines.
An interrupt which can be never be turned off (ie. disabled) is called as Non-Maskable interrupt.
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