Homework 3 Aid Understanding Homework 2/3 Program
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1 Homework 3 Aid Understanding Homework 2/3 Program
2
3 Adjust this number for 1 sec. blink on your computer. $0040 will increase delay by twice long.
4
5 Delay Subroutine Timing: $ > $0010 twice faster blinking $4FFF ---> $ times faster blinking (20479) (20)
6 Blinking ---> Dimming Pulse Width Modulation
7 50% Dimming Loop BSET PORTB,% ; Turn OFF LED 4 at PORTB7 JSR delay1ms ; Wait for 1 msecond BCLR PORTB,% ; Turn ON LED 4 at PORTB7 JSR delay1ms ; Wait for 1 msecond BRA Loop ; loop forever!
8 50% Dimming Loop BSET PORTB,% ; Turn OFF LED 4 at PORTB7 JSR delay1ms ; Wait for 1 msecond BCLR PORTB,% ; Turn ON LED 4 at PORTB7 JSR delay1ms ; Wait for 1 msecond BRA Loop ; loop forever! Total blinking in 1 sec?
9 10% Dimming Loop BSET PORTB,% ; Turn OFF LED 4 at PORTB7 JSR delay1ms ; Wait for 1 msecond JSR delay1ms ; Wait for 1 msecond JSR delay1ms ; Wait for 1 msecond JSR delay1ms ; Wait for 1 msecond JSR delay1ms ; Wait for 1 msecond JSR delay1ms ; Wait for 1 msecond JSR delay1ms ; Wait for 1 msecond JSR delay1ms ; Wait for 1 msecond JSR delay1ms ; Wait for 1 msecond BCLR PORTB,% ; Turn ON LED 4 at PORTB7 JSR delay1ms ; Wait for 1 msecond BRA Loop ; loop forever! Total blinking in 1 sec?
10 6% Dimming Loop BSET PORTB,% ; Turn OFF LED 4 at PORTB7 JSR delay1ms ; Wait for 1 msecond JSR delay1ms ; Wait for 1 msecond ; X 94 JSR delay1ms ; Wait for 1 msecond BCLR PORTB,% ; Turn ON LED 4 at PORTB7 JSR delay1ms ; Wait for 1 msecond JSR delay1ms ; Wait for 1 msecond ; X 6 JSR delay1ms ; Wait for 1 msecond BRA Loop ; loop forever! Total blinking in 1 sec?
11 No Dimming, only blinking 10 times/sec Revised: 6% Dimming Loop BSET PORTB,% ; Turn OFF LED 4 at PORTB7 JSR delay10us ; Wait for 10 usecond JSR delay10us ; Wait for 10 usecond ; X 94 JSR delay10us ; Wait for 10 usecond BCLR PORTB,% ; Turn ON LED 4 at PORTB7 JSR delay10us ; Wait for 10 usecond JSR delay10us ; Wait for 10 usecond ; X 6 JSR delay10us ; Wait for 10 usecond BRA Loop ; loop forever! Total blinking in 1 sec?
12 True Dimming, 100 times/sec
13 Determine how many times the instruction SUBA in the program below is executed if NUM=200. NUM: EQU 200 DLY: LDAA #NUM : SUBA #$01 times How long will it take to run the above subroutine DLY, running on the CSM- 12C128 board with 24MHz clock? Show your work.
14 JSR DLY
15 DLY: LDAA #1 : SUBA #1
16 DLY: LDAA #2 : SUBA #1
17 DLY: LDAA #3 : SUBA #1
18 DLY: LDAA #200 1 times : SUBA #1 200 times 200 times 1 times
19 OpCode and cycle look up: Table A-2, page 395 DLY: LDAA #200 1 cyc X 1 times, $86 : SUBA #$01 1 cyc X 200 times, $80 3 cyc X 199 times, $26 1 cyc X 1 times, $26 5 cyc X 1 times, $3D
20 OpCode and cycle look up: Table A-2, page 395 DLY: LDAA #200 1 cyc X 1 times, $86 : SUBA #$01 1 cyc X 200 times, $80 3 cyc X 199 times, $26 1 cyc X 1 times, $26 5 cyc X 1 times, $3D Total cycles: (1 X 1) + (1 X 200) + (3 X 199) + (1 X 1) + (5 X 1)
21 DLY: LDAA #N 1 cyc X 1 times : SUBA #$01 1 cyc X N times 3 cyc X (N-1) times 1 cyc X 1 times 5 cyc X 1 times Total cycles: (1 X 1) + (1 X N) + (3 X (N - 1)) + (1 X 1) + (5 X 1)
22 DLY: LDAA #N 1 cyc X 1 times : SUBA #$01 1 cyc X N times 3 cyc X (N-1) times 1 cyc X 1 times 5 cyc X 1 times Total cycles: (1 X 1) + (1 X N) + (3 X (N - 1)) + (1 X 1) + (5 X 1) = 1 + N + (3N - 3) = 7 + 4N - 3 = 4 + 4N
23 DLY: LDAA #200 : SUBA #$01
24 DLY: LDAA #200 : SUBA #$01 Total Cycles = 4 + 4N = * 200 = 804 cycles
25 How long will it take to run the following subroutine? Convert cycles to Second. DLY: LDAA #200 : SUBA #$01 Total Cycles = 804 cycles
26 How long will it take to run the following subroutine? Convert cycles to Second. DLY: LDAA #200 : SUBA #$01 CSM-12C128 board with 24MHz clock: 1 cycle = 1/24,000,000 Second
27 How long will it take to run the following subroutine? Convert cycles to Second. DLY: LDAA #200 : SUBA #$01 CSM-12C128 board with 24MHz clock: 1 cycle = 1/24,000,000 Second 804 cycles => 804/24,000,000 Second
28 How long will it take to run the following subroutine? Convert cycles to Second. DLY: LDAA #200 : SUBA #$01 CSM-12C128 board with 24MHz clock: 1 cycle = 1/24,000,000 Second 804 cycles => 804/24,000,000 Second = 33.5 usec.
29 Find N to create 10uSec delay: DLY: LDAA #N : SUBA #$01
30 Find N to create 10uSec delay: DLY: LDAA #N : SUBA #$01 1 cycle = 1/24,000,000 Second
31 Find N to create 10uSec delay: DLY: LDAA #N : SUBA #$01 1 cycle = 1/24,000,000 Second? cycles X 1/24,000,000 Second = 10.0 usec.
32 Find N to create 10uSec delay: DLY: LDAA #N : SUBA #$01 1 cycle = 1/24,000,000 Second 240 cycles X 1/24,000,000 Second = 10.0 usec.
33 Find N to create 10uSec delay: DLY: LDAA #N : SUBA #$01 1 cycle = 1/24,000,000 Second 240 cycles X 1/24,000,000 Second = 10.0 usec. Total Cycles = 4 + 4N
34 Find N to create 10uSec delay: DLY: LDAA #N : SUBA #$01 1 cycle = 1/24,000,000 Second 240 cycles X 1/24,000,000 Second = 10.0 usec. 240 = 4 + 4N
35 Find N to create 10uSec delay: DLY: LDAA #N : SUBA #$01 1 cycle = 1/24,000,000 Second 240 cycles X 1/24,000,000 Second = 10.0 usec = 4N
36 Find N to create 10uSec delay: DLY: LDAA #N : SUBA #$01 1 cycle = 1/24,000,000 Second 240 cycles X 1/24,000,000 Second = 10.0 usec. 236 = 4N
37 Find N to create 10uSec delay: DLY: LDAA #N : SUBA #$01 1 cycle = 1/24,000,000 Second 240 cycles X 1/24,000,000 Second = 10.0 usec. 59 = N
38 Find N to create 10uSec delay: DLY: LDAA #59 : SUBA #$01
39 Find N to create 10uSec delay: DLY: LDAA #$3B : SUBA #$01
40 Find N to create 10uSec delay: DLY: PSHA LDAA #N : SUBA #$01 PULA
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