main.c

来自「英飞凌XC164CS系列单片机的源码」· C语言 代码 · 共 40 行

/*-----------------------------------------------------------------------------
Define Port 7, Direction Register, and Open Drain Register.
-----------------------------------------------------------------------------*/
sfr DP7  = 0xFFD2;
sfr ODP7 = 0xF1D2;
sfr P7   = 0xFFD0;

sbit P7_0 = P7^0;
sbit P7_4 = P7^4;

/*-----------------------------------------------------------------------------
MAIN C Function
-----------------------------------------------------------------------------*/
void main (void)
{
/*-----------------------------------------------
Configure P7.7-P7.4 as Outputs.
Configure P7.3-P7.0 as Inputs.
-----------------------------------------------*/
DP7  = 0xF0;    /* Configure P7.7-P7.4 for output, P7.3-P7.0 for input */
ODP7 = 0xFF;    /* Setup P7.7-P7.0 for open-drain */

/*-----------------------------------------------
This loop reads P7.0 and writes the value read
to P7.4.

Open the Port 7 Dialog from the Peripherals Menu
and change the value of the P7.0 Pin.  When you
set P7.0 LO, P7.4 outputs LO.  When you set 
P7.0 HI, P7.4 outputs HI.
-----------------------------------------------*/
while (1)
  {
  P7_4 = P7_0;
  }
}

/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/