When the PS(active low)/EN(active low) pin of 8259A used in buffered mode, then it can be used as a
A. input to designate chip is master or slave
B. buffer enable
C. buffer disable
D. none
Answer:A
When the PS(active low)/EN(active low) pin of 8259A used in buffered mode, then it can be used as a
A. input to designate chip is master or slave B. buffer enable C. buffer disable D. none
Explanation: When the pin is used in buffered mode, then it can be used as a buffer enable to control buffer transreceivers. If it is not used in buffered mode, then the pin is used as input to designate whether the chip is used as a master or a slave.