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14.6 A- Fill in the Blanks for the required C instructions, and also fill in the missing comments
14.6 A- Fill in the Blanks for the required C instructions, and also fill in the missing comments
/*******************************************************************
This program outputs 30 kHz square wave on
port T, bit-0 using timer channel 0 interrupts and the
output compare bit operations.
*******************************************************************/
#include <mc9s12c32.h> /* derivative information */
#define HALF_P 133 /* Number clocks per 1/2 period */
/******************************************************************/ void interrupt 8 OC0_isr (void);
/******************************************************************/ void main(void) {
/******************************************************************/
/* Initialize I/O */
___________________ = 1; /* Enable the timer */
/*which Register, Which Flag bit */
TIOS_IOS0 = _________; /* Enable output compare channel 0 */
/* Set up TC0 */
_________________ = TCNT;
/* Now have ~ 8 ms to set up the system without an interrupt */
TFLG1 = TFLG1_C0F_MASK;/* Clear C0F flag */
__________________ = 1; /* Enable the interrupt */
/* Set up the output compare action to toggle
* port T, bit-0. (DDRT does not need to be set.)
*/
TCTL2_OM0 = 0;
TCTL2_OL0 = 1;
EnableInterrupts; /* Unmask interrupts */
/* DO */
for(;;) {
}
/* FOREVER */
}
/******************************************************************* * The interrupt service routine simply sets up the TC0
* for the next interrupt time.
*******************************************************************/ void interrupt 8 OC0_isr ( void ){
/******************************************************************/
/* Set up TC0, How? Need to add what Register? */
TC0 += _______________________;
TFLG1 = TFLG1_C0F_MASK; /* ______________________________________ */
}
