The 8255 shown in Figure below is configured as follows: port A as input, B as output, and all the bits of port C as output. (a) Find the port addresses assigned to A, B, C, and the control register, basic address is (00H). (b) Find the control byte (word) for this configuration. DO D7 DO D7 A. IOW IOR WR RD A0 A0 CL A2- A1 A1 CS CU A7 个介介

The 8255 shown in Figure below is configured as follows: port A as input, B as output, and all the bits of port C as output. (a) Find the port addresses assigned to A, B, C, and the control register, basic address is (00H). (b) Find the control byte (word) for this configuration. DO D7 DO D7 A. IOW IOR WR RD A0 A0 CL A2- A1 A1 CS CU A7 个介介

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter11: Operating Systems

Section: Chapter Questions

Problem 30VE

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