Question $3$

GPTM Timer $-$ Input Capture

Answer $3$a $-3$e using the following information.

Suppose Timer $2$A is configured for $16-$bit, count$-$down, edge$-$time, capture mode and uses the $16$ MHz system clock.

Below is a graph of the timer operation as it repeatedly counts down from the maximum count value.

Let F $=$ count value $0$xCCC$6,$ G $=$ count value $0$x$7$FFD$,$ and H $=$ count value $0$x$5$FFB$.$

timer$-$graph.png

Question $3$d

Provide mask values to complete the following lines of code. These lines of code appear at the beginning of the interrupt handler for Timer $2$A to process a capture event interrupt $($in input edge$-$time mode$).$ This code checks whether the expected interrupt occurred, and if so$,$ clears the interrupt status bits and executes other code. Use friendly code that preserves unused bits. Write your answer in hex. Do not include leading zeros, e$.$g$.,0$x$01$ should be written as $0$x$1.$

if $(($TIMER$2\_$MIS$\_$R & mask$1)$

$\{$

TIMER$2\_$ICR$\_$R $|=$ mask$2$;

$...\}$

mask$1($in hex$)$:

mask$2($in hex$)$: