Question

Which SFR bit should be polled to detect Timer 1 overflow?

Question 1 options:
a. TMR1IE
b. TMR1IF
c. TMR1H
d. TMR1L

Answer 1

To detect Timer 1 overflow in microcontroller programming, the TMR1IF bit must be polled. It indicates when an overflow has occurred, and it should be cleared after the event is handled.

Step-by-step explanation:

To detect a Timer 1 overflow in microcontroller programming, the specific Special Function Register (SFR) bit that should be polled is b. TMR1IF. This bit stands for Timer1 Interrupt Flag. When Timer 1 overflows, this flag bit is set. Therefore, by polling TMR1IF, we can determine if an overflow has occurred. It is important to clear this bit in software after the overflow condition has been handled to ensure future overflow events can be detected correctly. Other options like TMR1IE, TMR1H, and TMR1L serve different purposes such as enabling Timer 1 interrupt or holding the high and low order bytes of the Timer 1 register, respectively.

Answer: b. TMR1IF