3. Write an instruction sequence to generate a 15 Hz digital waveform with 35% duty cycle using the 16-bit mode from the PWM5 output pin and stop PWM in wait and freeze modes. Assume the E clock @ 24 MHz. Using the following setting: • Set 25 as its down count value. • Set the prescale factor to 16. • Set PWM5 output to start with low level. • Select center aligned mode. Fill in the blanks for the following: movb # $20, PWME movb # 0 movb # $20 movb # $04 movb # $20, PWMCAE movb # $4C, PWMCTL PWMPOL PWMCLK PWMPRCLK movb #25/$19, PWMSCL_A_ movw # 1000 PWMPER 4 movw # 650, PWMDTY_4 Period of 15 Hz 1/15 sec ; Clock B = 24 MHz/16 = 1.5 MHz Clock SB = Clock B / (2 x PWMSCLB) = 1.5 MHz/ (2 x 25) = 30 KHz 1 30000 # of counts for 1/15 sec = 1 [PWMPER4] 1000 1/15 1/30000 15 =-X- = 2000 ; 2000x0.65 1300 [PWMDTY4] = 650
3. Write an instruction sequence to generate a 15 Hz digital waveform with 35% duty cycle using the 16-bit mode from the PWM5 output pin and stop PWM in wait and freeze modes. Assume the E clock @ 24 MHz. Using the following setting: • Set 25 as its down count value. • Set the prescale factor to 16. • Set PWM5 output to start with low level. • Select center aligned mode. Fill in the blanks for the following: movb # $20, PWME movb # 0 movb # $20 movb # $04 movb # $20, PWMCAE movb # $4C, PWMCTL PWMPOL PWMCLK PWMPRCLK movb #25/$19, PWMSCL_A_ movw # 1000 PWMPER 4 movw # 650, PWMDTY_4 Period of 15 Hz 1/15 sec ; Clock B = 24 MHz/16 = 1.5 MHz Clock SB = Clock B / (2 x PWMSCLB) = 1.5 MHz/ (2 x 25) = 30 KHz 1 30000 # of counts for 1/15 sec = 1 [PWMPER4] 1000 1/15 1/30000 15 =-X- = 2000 ; 2000x0.65 1300 [PWMDTY4] = 650
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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