LL16库IO操作说明

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/**************** registers I/O map ****************/ 
I/O地址寄存器，这个用来读取和设置IO电平，高或者低
 
/*** PTAD - Port A Data Register; 0x00000000 ***/
typedef union {
  byte Byte;
  struct {
    byte PTAD0       :1;                                       /* Port A Data Register Bit 0 */
    byte PTAD1       :1;                                       /* Port A Data Register Bit 1 */
    byte PTAD2       :1;                                       /* Port A Data Register Bit 2 */
    byte PTAD3       :1;                                       /* Port A Data Register Bit 3 */
    byte PTAD4       :1;                                       /* Port A Data Register Bit 4 */
    byte PTAD5       :1;                                       /* Port A Data Register Bit 5 */
    byte PTAD6       :1;                                       /* Port A Data Register Bit 6 */
    byte PTAD7       :1;                                       /* Port A Data Register Bit 7 */
  } Bits;
} PTADSTR;
extern volatile PTADSTR _PTAD @0x00000000;
#define PTAD                            _PTAD.Byte
#define PTAD_PTAD0                      _PTAD.Bits.PTAD0
#define PTAD_PTAD1                      _PTAD.Bits.PTAD1
#define PTAD_PTAD2                      _PTAD.Bits.PTAD2
#define PTAD_PTAD3                      _PTAD.Bits.PTAD3
#define PTAD_PTAD4                      _PTAD.Bits.PTAD4
#define PTAD_PTAD5                      _PTAD.Bits.PTAD5
#define PTAD_PTAD6                      _PTAD.Bits.PTAD6
#define PTAD_PTAD7                      _PTAD.Bits.PTAD7
#define PTAD_PTAD0_MASK                 1
#define PTAD_PTAD1_MASK                 2
#define PTAD_PTAD2_MASK                 4
#define PTAD_PTAD3_MASK                 8
#define PTAD_PTAD4_MASK                 16
#define PTAD_PTAD5_MASK                 32
#define PTAD_PTAD6_MASK                 64
#define PTAD_PTAD7_MASK                 128

/*** PTADD - Port A Data Direction Register; 0x00000001 ***/
PTADD：Port A数据方向寄存器
这个主要用来设置IO的方向，0位输出，1位输入。

typedef union {
  byte Byte;
  struct {
    byte PTADD0      :1;                                       /* Data Direction for Port A Bit 0 */
    byte PTADD1      :1;                                       /* Data Direction for Port A Bit 1 */
    byte PTADD2      :1;                                       /* Data Direction for Port A Bit 2 */
    byte PTADD3      :1;                                       /* Data Direction for Port A Bit 3 */
    byte PTADD4      :1;                                       /* Data Direction for Port A Bit 4 */
    byte PTADD5      :1;                                       /* Data Direction for Port A Bit 5 */
    byte PTADD6      :1;                                       /* Data Direction for Port A Bit 6 */
    byte PTADD7      :1;                                       /* Data Direction for Port A Bit 7 */
  } Bits;
} PTADDSTR;
extern volatile PTADDSTR _PTADD @0x00000001;
#define PTADD                           _PTADD.Byte
#define PTADD_PTADD0                    _PTADD.Bits.PTADD0
#define PTADD_PTADD1                    _PTADD.Bits.PTADD1
#define PTADD_PTADD2                    _PTADD.Bits.PTADD2
#define PTADD_PTADD3                    _PTADD.Bits.PTADD3
#define PTADD_PTADD4                    _PTADD.Bits.PTADD4
#define PTADD_PTADD5                    _PTADD.Bits.PTADD5
#define PTADD_PTADD6                    _PTADD.Bits.PTADD6
#define PTADD_PTADD7                    _PTADD.Bits.PTADD7
#define PTADD_PTADD0_MASK               1
#define PTADD_PTADD1_MASK               2
#define PTADD_PTADD2_MASK               4
#define PTADD_PTADD3_MASK               8
#define PTADD_PTADD4_MASK               16
#define PTADD_PTADD5_MASK               32
#define PTADD_PTADD6_MASK               64
#define PTADD_PTADD7_MASK               128
8位系列的芯片，IO口的操作是类似的，所以这里以LL16为例说明。在使用IO的时候，必须要先设置方向，再设置和读取IO口电平。
例如：
void IO_INI(void)
{
   PTADD_PTADD0=0;//设置PTAD0的0脚为输出
  PTADD_PTADD1=1;//设置PTAD0的1脚为输入
  //或者设置PTADD=0X02;
}
void main()
{
EnableInterrupts;
IO_INI();
for(;;)
 {
   PTADD_PTADD0= ~PTADD_PTADD0;
}
 }
 
 

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