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Example 3-20 Write a program to toggle all the bits of I/O register PORTB every 1 s. Assume that the crystal frequency is 16 MHz and the system is using an ATmega328. Solution: .ORG O LDI OUT R16, HIGH (RAMEND) SPH RIG

Example 3-20 Write a program to toggle all the bits of I/O register PORTB every 1 s. Assume that the crystal frequency is 16 MHz and the system is using an ATmega328. Solution: .ORG O LDI OUT R16, HIGH (RAMEND) SPH RIG

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Trying to learn Assembly (Person Problem not graded)

Example 3-20 Write a program to toggle all the bits of I/O register PORTB every 1 s. Assume that the crystal frequency is 16 MHz and the system is using an ATmega328. Solution: .ORG O BACK: LDI OUT LDI OUT L1: L2: 13: LDI COM OUT CALL RJMP DELAY 1S: LDI LDI LDI DEC BRNE R16, HIGH (RAMEND) SPH, R16 R16, LOW (RAMEND) SPL, R16 R16,0x55 R16 PORTB, R16 DELAY 1S BACK R20, 64 R21, 200 R22,250 NOP NOP DEC BRNE L3 R22 R21 L2 DEC BRNE L1 RET R20 ; load R16 with 0x55 ; complement PORTB ; send it to port B ;time delay ; keep doing this indefinitely 2014
Transcribed Image Text:Example 3-20 Write a program to toggle all the bits of I/O register PORTB every 1 s. Assume that the crystal frequency is 16 MHz and the system is using an ATmega328. Solution: .ORG O BACK: LDI OUT LDI OUT L1: L2: 13: LDI COM OUT CALL RJMP DELAY 1S: LDI LDI LDI DEC BRNE R16, HIGH (RAMEND) SPH, R16 R16, LOW (RAMEND) SPL, R16 R16,0x55 R16 PORTB, R16 DELAY 1S BACK R20, 64 R21, 200 R22,250 NOP NOP DEC BRNE L3 R22 R21 L2 DEC BRNE L1 RET R20 ; load R16 with 0x55 ; complement PORTB ; send it to port B ;time delay ; keep doing this indefinitely 2014
Write an assembly language program, using a triple loop concept, to generate a ½-second delay and toggle a signal on PORTB. See Example 3-20 in the textbook (page 103 in the 2nd edition) for an example of the triple loop idea. Get the delay as close to a ½-second as possible.
Transcribed Image Text:Write an assembly language program, using a triple loop concept, to generate a ½-second delay and toggle a signal on PORTB. See Example 3-20 in the textbook (page 103 in the 2nd edition) for an example of the triple loop idea. Get the delay as close to a ½-second as possible.
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