Pin labeled PB4 (or PORTB4) is meant to be used for? i. Analog input onlyAnalog

Question

Pin labeled PB4 (or PORTB4) is meant to be used for? i. Analog input onlyAnalog input and digital input/output ii. Analong input and digital input/output iii. Digital output only iv. Digital input or digital output b. If the MCU is running on a 20MHz clock and it is desired to program a 16-bit timer, to implement an 80KHz PWM with 25% duty cycle non-inverting fast PWM mode using ICR1 to store the top value, then which choice of pre-scalar is preferred given that interrupt on overflow is to used and precision in timing is required? i. 1 (no pre-scaling) ii. 8 iii. 256 iv. 1024 c. Bit 4 - ADIF in register ADCSRA: ADC Interrupt Flag is set when an ADC conversion completes and the Data Registers are updated The ADC Conversion Complete Interrupt is executed if the ADIE bit and the l-bit in SREG are set. ADIF is cleared by hardware when executing the corresponding interrupt handling vector. Alter- natively. ADIF is cleared by writing a logical one to the flag. Beware that if doing a Read-Modify- Write on ADCSRA. a pending interrupt can be disabled Which of the following statements waits for ADC conversion to end? i. while ((ADCSRA & (1

Explanation / Answer

a)PORTB4 OUT DIGITAL OUTPUT

b)256

c) while(ADCSRA & (1<<ADIF))==0

d)STAEMENT THREE SET to ADIF TO zero

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