pwm.h

以ST公司CPU为核心的彩色电视机的完整源程序。

#ifndef _PWM
#define _PWM

/************************************************************************/
/*									*/
/*	ST9 family PWM control registers      release 4.0		*/
/*		ST9 FAMILY PULSE WIDTH MODULATOR REGISTERS.		*/
/*									*/
/************************************************************************/

/* PWM page values */

#define PWM_PG	((unsigned char)59)		      /* PWM page */

/* OSD control registers */

register volatile unsigned char P_CMR0		asm("R240");		/* channel 0 compare register */
register volatile unsigned char P_CMR1		asm("R241");		/* channel 1 compare register */
register volatile unsigned char P_CMR2		asm("R242");		/* channel 2 compare register */
register volatile unsigned char P_CMR3		asm("R243");		/* channel 3 compare register */
register volatile unsigned char P_CMR4		asm("R244");		/* channel 4 compare register */
register volatile unsigned char P_CMR5		asm("R245");		/* channel 5 compare register */
register volatile unsigned char P_CMR6		asm("R246");		/* channel 6 compare register */
register volatile unsigned char P_CMR7		asm("R247");		/* channel 7 compare register */
register volatile unsigned char P_ACR		asm("R248");		/* autoclear register */
register volatile unsigned char P_CCR		asm("R249");		/* counter register */
register volatile unsigned char P_CTLR		asm("R250");		/* prescaler and control register */
register volatile unsigned char P_OCPLR		asm("R251");		/* output complement register */
register volatile unsigned char P_OER		asm("R252");		/* output enable register */

/* P_CREG : prescaler and control register */

#define Pm_ce		   ((unsigned char)0x01)			/* counter enable mask */
#define Pm_clear	   ((unsigned char)0x02)			/* clear counter mask */

#define Pm_ce_dis	   ((unsigned char)0x00)			/* counter disable */
#define Pm_ce_en	   ((unsigned char)0x01)			/* counter enable */
#define Pm_clear_load	   ((unsigned char)0x02)			/* clear counter and reload prescaler */

#endif