Type definitons - mcf5225.h

[lel_chen]

Hi,

       The controller that I am using is MCF52259.

1) How can I read the general purpose register "D0"?

2) Is mcf5225.h the header file to be used for type definitons of the registers?

If YES,

--> The reset control register of M52259 is an 8 bit register, whereas, the file "mcf5225.h" specifies it as a 16 bit int.

" uint_16 RCON; // Reset Configuration Register"

Why is this change? Or is there a seperate header file for M52259?

Thanks,

Chen

[JuroV]

Hi.

1) What is 'general purpose register D0' ?

2) Yes, it is used also for definitions of registers.

Reset Configuration Register (RCON) is 16 bit wide register in mcf52259 (MCF52259 Ref. Manual, Rev. 1).

[lel_chen]

Sorry, my question was not about Reset Config Register[RCON], but Reset Control Register [RCR] in the reset controller module.

I could find it in mcf5222.h as:

------------------------------------------------------

typedef struct mcf5222_cim_struct

{

uchar RCR; // Reset control register

uchar RSR; // Reset status register

.......................

--------------------------------------------------------

But not in mcf5225.h

[EAI]

To access D0 (or any other core processor registers) from C code, you could use inline assembly. Search for 'asm' in codewarrior help. Here is one example given in the codewarrior help:

long int b;

struct mystruct {

  long int a;

} ;

static asm long f(void)     // Legal asm qualifier

{

  move.l   struct(mystruct.a)(A0),D0 // Accessing a struct.

  add.l    b,D0   // Using a global variable, put return value

                  // in D0.

  rts             // Return from the function:

                  // result = mystruct.a + b 

}