Intel Microcontroller, 80C196NU, 8XC196NP manual Programming Examples for EPA Channels

8XC196NP, 80C196NU USER’S MANUAL

10.8 PROGRAMMING EXAMPLES FOR EPA CHANNELS

The three programming examples provided in this section demonstrate the use of the EPA channel for a compare event, for a capture event, and for generation of a PWM signal. The programs dem- onstrate the detection of events by a polling scheme, by interrupts, and by the PTS. All three ex- amples were created using ApBUILDER, an interactive application program available through Intel Literature Fulfillment. These sample program were written in the C programming language. ASM versions are also available from ApBUILDER.

NOTE

The initialization file (80c196np.h) used in these examples is available from the Intel Applications BBS.

10.8.1 EPA Compare Event Program

This example C program demonstrates an EPA compare event. It sets up EPA channel 0 to toggle its output pin whenever timer 1 is zero. This program uses no interrupts; a polling scheme detects the EPA event. The program initializes EPA channel 0 for a compare event.

#pragma model(EX) #include <80c196np.h>

#define	COMPARE		0x40
#define	RE_ENABLE		0x08
#define	TOGGLE_PIN		0x30
#define	USE_TIMER1		0x00
#define	EPA0_INT_BIT			7
void init_epa0()
{			¦
epa0_con =		COMPARE		¦
		TOGGLE_PIN
		RE_ENABLE		¦
		USE_TIMER1;

epa0_time = 0;
setbit(p1_reg, 0); /*	int reg */
clrbit(p1_dir, 0); /*	make output pin */
setbit(p1_mode, 0);/*	select EPA	mode */

}

void init_timer1()

{

t1control = COUNT_ENABLE ¦ COUNT_UP ¦

CLOCK_INTERNAL ¦ DIVIDE_BY_1;

}

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