The Intel 8255 processor with an 8-bit data bus is configured as shown in the figure below ( PORT_A as INPUT, PORT_B as OUTPUT, PORT_CL as INPUT and PORT_CH as OUTPUT). Find the control register for the indicated configuration. HINT: Assuming not using the BSR to control PCs PORTS, only considering using the I/O MODE with a digit of 1. A0 Port_A 7 A1 CONTROL WORD (BYTE) D7 D6 D5 D4 D3 D2 D1 DO ?? ? ? ?? ? ? Control Word CS Port B 1= /O Mode 0- BSR Mode Port CL (PC3-PC0) 1=INPUT; 0 = OUTPUT RD 7 Mode Select 00 - Mode 0 01 - Mode 1 1x = Mode 2 Port B 1- INPUT; 0 = OUTPUT WR Mode Select 0 = Mode 0 1=mode 1 Port_CL DO D1 D2 D3 DATA D4 BUS Port A 3 1= INPUT Port CH 0 = OUTPUT (PC7-PC4) 4 1= INPUT; 0 = OUTPUT Port_CH D6 BSR AFFECTS ONLY THE 8255 7 O a. The control register is 00h. O b. The control register is 91h. OC. The control register is 19h. O d. The control register is 11h. E2345ON INTEL 8253/8254/8255

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