Fujitsu 8FX MB2146-510-01-E, Setup Manual

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4.3.1 Header Files
The MB95560.h and the _f2mc8fx.h are header files, included MB95560H/570H/580H MCU I/O
registers definition;
Here take PDR0 for example. In MB95560.h, PDR0 is defined as below.
/* REGISTER BIT STRUCTURES */
#ifdef __IO_DEFINE
#pragma segment IO=IO_PDR0, locate=0x0
#endif
typedef union {
__BYTE byte;
struct {
__BYTE P00:1;
__BYTE P01:1;
__BYTE P02:1;
__BYTE P03:1;
__BYTE P04:1;
__BYTE P05:1;
__BYTE P06:1;
__BYTE P07:1;
} bit;
struct {
__BYTE P00:1;
__BYTE P01:1;
__BYTE P02:1;
__BYTE P03:1;
__BYTE P04:1;
__BYTE P05:1;
__BYTE P06:1;
__BYTE P07:1;
} bitc;
} PDR0STR;
__IO_EXTERN PDR0STR IO_PDR0;
#define _pdr0 (IO_PDR0)
#define PDR0 (IO_PDR0.byte)
#define PDR0_P00 (IO_PDR0.bit.P00)
#define PDR0_P01 (IO_PDR0.bit.P01)
#define PDR0_P02 (IO_PDR0.bit.P02)
#define PDR0_P03 (IO_PDR0.bit.P03)
#define PDR0_P04 (IO_PDR0.bit.P04)
#define PDR0_P05 (IO_PDR0.bit.P05)
#define PDR0_P06 (IO_PDR0.bit.P06)
#define PDR0_P07 (IO_PDR0.bit.P07)