Intel 8XC196NP, 80C196NU, Microcontroller manual EPA PWM Output Program, Unsigned char Unused Ptscon

8XC196NP, 80C196NU USER’S MANUAL

time_value = epa0_time; /* must read to prevent overrun */

}

void init_timer1()

{

t1control = COUNT_ENABLE ¦ COUNT_UP ¦

CLOCK_INTERNAL ¦ DIVIDE_BY_1;

}

void main(void)

{

unsigned int time_value;

/* Initialize the timers and interrupts before using the EPA */ init_timer1();

init_epa0();
enable();	/*	Globally enable interrupts */
while(1);	/*	loop forever, wait for interrupts to occur */
}

10.8.3 EPA PWM Output Program

This example C program demonstrates the generation of a PWM signal using the EPA’s PWM toggle mode (see “PWM Modes” on page 6-26) and shows how to service the interrupts with the PTS. The PWM signal in this example has a 50% duty cycle.

#pragma model(EX)
#include <80c196np.h>
#define	PTS_BLOCK_BASE	0x98
/* Create	typedef template for the PWM_TOGGLE mode control block.*/
typedef struct PWM_toggle_ptscb_t {
	unsigned char	unused;
	unsigned char	ptscon;
	void *pts_ptr;

unsigned int constant1; unsigned int constant2; } PWM_toggle_ptscb;

/* This locates the PTS block mode control block in register ram. This */ /* control block may be located at any quad-word boundary. */

register PWM_toggle_ptscb PWM_toggle_CB_3; #pragma locate(PWM_toggle_CB_3=PTS_BLOCK_BASE)

/* The PTS vector must contain the address of the PTS control block.*/ #pragma pts(PWM_toggle_CB_3=0x3)

/* Sample PTS control block initialization sequence.*/

10-26