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HW5soln-3750

HW5soln-3750 - 1 EE 3750 HW 5 solutions EE 3750 Homework 5...

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EE 3750 — HW 5 solutions 1 EE 3750 — Homework 5 solutions Fall 2001 1. Write an instruction sequence to program a single 8259A to operate as the only 8259A in the system and provide the following features. The lowest port address of the 8259 is 84H. • level-triggered interrupts • a base interrupt vector number of 58H • no special fully nested mode SP / EN to output a disable signal to the data bus transceivers • AEOI mode enabled • place IR3 at the lowest priority level MOV AL, 1BH ; value to ICW1 = xxx11x11 B OUT 84H, AL ; ICW1 at even address MOV AL, 58H ; value to ICW2 sets interrupt type OUT 85H, AL ; ICW2 at odd address, next in initialization sequence MOV AL, 0FH ; value to ICW4 = 00001111 B OUT 85H, AL ; ICW4 at odd address, next in initialization sequence MOV AL, 11000011B ; value to OCW2 rotates IR3 to lowest priority level OUT 84H, AL ; OCW2 at even address 2. Write an instruction sequence that will initialize an 8251A so that it will receive asynchronous characters containing 8 data bits, 1 1 2 stop bits, and even parity.
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