
        /* clear bit 3 in the data direction register */
        /* to make line 3 (from device 1) in the general */
        /* purpose I/O register an input line.  Just for */
        /* fun, do it four different, but equivalent, ways. */


#include "mfp_defs.h"           /* MFP address definitions */
#include "mfp_macs.h"           /* MFP macro definitions */

#define BIT3_MASK  0xf7         /* mask for clearing bit 3 */


dev_input()
{
        *(unsigned char *)DDR &= BIT3_MASK;

        REGVAL(DDR) &= BITOFF_MASK(DEVICE_1);

        CLR_BITS(DDR,BITOFF_MASK(DEVICE_1));

        BIT_CLR(DDR,DEVICE_1);
}



