Question

FROM The HCS12 / 9S12 (2nd Edition) E4.19

please use C language to write the code and submit the code and pictures of the running circuit on the board.

(1) Write an instruction sequence to configure Port A and Port B for input and output,

respectively; read the value of Port A and output the value to Port B.

Answer 1

#include <hidef.h>           /* common defines and macros */

#include "derivative.h"      /* derivative-specific definitions */

main()

{

DDRA = 0x00     /*Make PORTA as input*/

PORTA = 1;       /*initialize all input with value 1*/   

DDRB = 0xff;     /* Make PORTB output */

PORTB = 0;       /* Start with all off */

while(1)

{

PORTB = PORTA;  /*Assign the values of PORT A(input PORT) to PORT B

}

}