ctype.h

AVR系列被广泛应用的单片机MEGA8开发(原理图)及例程

Analog Comparator Interrupt Flag. 
	#define	ACIE	0x08	 
	#define	ACIC	0x04	 
	#define	ACIT	0x00	// Interrupt on Toggle. 
	#define	ACIF	0x02	// Interrupt on Falling Edge. 
	#define	ACIR	0x03	// Interrupt on Rising Edge. 
	#define	NACIR	0xFC	// Not ACIR	- Clear.	 

// ADC Multiplexer Sel