www.pudn.com > GENIE-SHELL.rar > BITOPS.H

/*These are the standard ANSI bit operation macros.  They are used by */ 
/*microcontrollers that don't have special bit operation instructions.*/ 
 
#define BIT(x)  (1 << (x))                  /*used by bit op macros   */ 
 
#define BIT0 0x01                           /*used by bit op macros   */ 
#define BIT1 0x02 
#define BIT2 0x04 
#define BIT3 0x08 
#define BIT4 0x10 
#define BIT5 0x20 
#define BIT6 0x40 
#define BIT7 0x80 
 
/* this macro sets a bit in the specified register or memory location */ 
#define SETBIT(reg,bit) reg|=bit 
 
/* this macro clrs a bit in the specified register or memory location */ 
#define CLRBIT(reg,bit) reg&=(~bit) 
 
/* this macro toggles a bit in the spec'd register or memory location */ 
#define TGLBIT(reg,bit) reg^=bit 
 
/* this macro tests a bit, returning a non-zero val if bit is set *****/ 
#define TSTBIT(reg,bit) (reg&bit)