Quiz3F07sol - EE319K Fall 2007 Quiz 3 Solution(5 Question 1...

EE319K Fall 2007 Quiz 3 Solution Page 1
Jonathan W. Valvano November 28, 2007 10:00am-10:50am
(5) Question 1. A) Finish instruction, push registers, I=1, PC=vector, execute ISR.
(5) Question 2. 2
12
=4096, 5V/4096, which is about 1.2mV
(5) Question 3. (We can reduce dropout by multiplying before divide by 100)
Start with the goal of the problem: A = H * W
Specify the fixed-point definitions: A = IA /100, W = IW /100, H = IH /100
Substitute definitions into problem: IA /100 = IW /100 * IH /100
Solve algebraic IA = ( IW * IH) /100
Questions 4 and 5 Hand execute and build a stack picture
SP In In
SP
In
SP Cnt
In
SP
Cnt
OldA
0,SP
1,SP
2,SP
3,SP
4,SP
5,SP
6,SP
7,SP
movw #1000,2,-sp
jsr sub2
des
psha
pshx
(5) Question 4. in set 6 ; binding of 16-bit input parameter
(5) Question 5. cnt set 3 ; binding of 8-bit local variable
(15) Question 6. Any resistor set that is a power of 2 is OK.
PM2
8k Ω
PM3
4k Ω
PM1
16k Ω
PM4
2k Ω
PM0
32k
Ω
Vout
(5) Question 7. C) The software writes to the ATDCTL5 register.
(5) Question 8. fdb Brake,Go
(5) Question 9. ldab 0,y (or ldab 1,y+)
(5) Question 10. ldy 1,y (or ldy 0,y)
(5) Question 11. C) Because the Fifo queue decouples execution of producer and consumer.
(5) Question 12.