Computer Science

CE262

Branching and Looping

1.Watch videos entitled “Module 4 – Introduction” and “Module 4 – Branching and Looping”

2.Using the microprocessor simulator, open the program 02light.asm.

3.Step through its execution to understand its current operation.

4.Complete the table in the Ports section of the lab to determine the appropriate Hexadecimal values to use to control the traffic lights.

5.Modify the program to step the lights through a realistic sequence. Include conditional statements that ensure that assembly program only executes for 10 times.

6.Include all of the following in a Word document entitled “Lab4_StudentID”. Where your student id is substituted in the file name. a.A screenshot of the modified assembly code

b.The values of the Ports table to control the traffic lights

c.A few screenshots that show the traffic lights on Port 1 as the program is stepped through

7.Upload file “Lab4_StudentID”.

; _____ THE REALISTIC TRAFFIC LIGHTS _____________________________

CLO ; close unwanted windows

start:

MOV BL,10 ; Start BL register at 10

; Turn off all traffic lights

MOV AL,10 ; Copy 00000000 into the AL register

OUT 01 ; Send AL to port one

MOV BL,0A ; BL=TEN

LOOP:

; Turn red lights on

MOV AL,90 ; Copy 10010000 into the AL register

OUT 01 ; Send AL to port one

MOV AL,10 ; Delay

; Turn on amber lights

MOV AL,48 ; Copy 01001000 into the AL register

OUT 01 ; Send AL to port one

MOV AL,10 ; Delay

; Turn on green lights

MOV AL,24 ; Copy 00100100 into AL register

OUT 01 ; Send AL to port one

MOV AL,10 ; Delay

DEC BL ; Subtract one from BL

JNZ LOOP ; Jump back to loop if BL was not zero

END ; Program ends

; —– Time Delay Procedure Stored At Address [30] ————-

ORG 30 ; Generate machine code from address [30]

PUSH AL ; Save AL on the stack.

PUSHF ; Save the CPU flags on the stack.

Rep:

DEC AL ; Subtract one from AL.

JNZ REP ; Jump back to Rep if AL was not Zero.

POPF ; Restore the CPU flags from the stack.

POP AL ; Restore AL from the stack.

RET ; Return from the procedure.

; —————————————————————

END

; —————————————————————

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