How to read MC9S12XEP100's globally unique chip ID?

[cornonly]

Hey,

I want to read MC9S12XEP100's globally unique chip ID by writing code.How should I do and How many bits are there in the MC9S12XEP100 chip ID?

[lama · Accepted solution]

Hi,

everything is explained int the data sheet..keywords Device ID, IFR, MMCCTL1, PGMIFRON 

However,....

Program IFR — Nonvolatile information register located in the P-Flash block that contains the Device ID, Version ID, and the Program Once field. The Program IFR is visible in the global memory map by setting the PGMIFRON bit in the MMCCTL1 register.

The device ID at 0x40_0000 - 0x40_0007 cannot be programmed and cannot be erased. I cannot tell you the meaning or coding of these bytes. The content in these 8-bytes is specific to NXP and is really of no use to the customer. However, I can confirm that each part has unique device ID.

For example:

//==============================================================================
unsigned int partID[4];
unsigned int versionID;
//==============================================================================
//==============================================================================
void main(void)
{
 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // read ID
 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 MMCCTL1_PGMIFRON = 1;                                                 // Program IFR Fields visible in the memory map

partID[0] = *((unsigned int * far) 0x400000);                          // Read program IFR Fields 
partID[1] = *((unsigned int * far) 0x400002);
partID[2] = *((unsigned int * far) 0x400003);
partID[3] = *((unsigned int * far) 0x400006);
versionID =  *((unsigned int * far) 0x4000E8);
 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~                                                   

 for(;;) {}
}
//==============================================================================

Best regards,

Ladislav