Page 227 - Programming Microcontrollers in C

212 Chapter 5 Programming Large 8-Bit Systems

unsigned char bit4 : 1;
unsigned char bit5 : 1;
unsigned char bit6 : 1;
unsigned char bit7 : 1;
} Register;

#define PORTA (*(volatile Register*)(Register_Set+0))

typedef struct {
unsigned char STAF :1;
unsigned char STAI :1;
unsigned char CWOM :1;
unsigned char HNDS :1;
unsigned char OIN :1;
unsigned char PLS :1;
unsigned char EGA :1;
unsigned char INVB :1;
}Pioc;

#define PIOC (*(volatile Pioc*)(Register_Set+2))

#define PORTC (*(volatile Register*)(Register_Set+3))
#define PORTB (*(volatile Register*)(Register_Set+4))
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#define TCNT (*(unsigned int *)(Register_Set+0xE))
#define TIC1 (*(unsigned int *)(Register_Set+0x10))
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/* To clear bits in the flag registers use the form

TFLG1 = OC1

to clear OC1F in TFLG1. Use this form only in the
two flag registers TFLG1 and TFLG2 below.
*/