Transcript Chapter 5: Building Assembler Programs

Assembler Exercises
Chapters 4-6
Dr. Gheith Abandah
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Exercise 1
z = x + y;
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Exercise 1
movf
addwf
movwf
x, 0
y, 0
z
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Exercise 2
z = x + y;
//16-bit numbers
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Exercise 2
movf
addwf
movwf
x_lo, 0
y_lo, 0
z_lo
btfsc
incf
status, C
x_hi, 1
movf
addwf
movwf
x_hi, 0
y_hi, 0
z_hi
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Exercise 3
sum = 0;
for (i=0; i<10; i++)
sum += A[i];
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Exercise 3
Loop
A
equ
20
movlw
movwf
movlw
movwf
clrw
addwf
incf
decfsz
goto
movwf
0a
counter
A
fsr
indf,0
fsr
counter
Loop
sum
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Assignment
• Study Section 5.9: The ping-pong program
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Exercise 4
z = (x + y) - q;
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Exercise 4
movf
addwf
movwf
movf
subwf
x,
y,
z
q,
z,
0
0
0
1
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Exercise 5
z = x-3;
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Exercise 5
movlw
subwf
movwf
3
x, 0
z
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Exercise 6
z = x<<3;
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Exercise 6
bcf
rlf
bcf
rlf
bcf
rlf
movwf
status, C
x, 1
status, C
x, 1
status, C
x, 0
z
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Exercise 7
z = x && 0x0f;
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Exercise 7
movlw
andwf
movwf
0f
x, 0
z
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Exercise 8
z = x * 4;
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Exercise 8
bcf
rlf
bcf
rlf
movwf
status, C
x, 1
status, C
x, 0
z
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