飞思卡尔单片机编程.docx

关于Codewarrior中的.prm 文件

网上广泛流传的一篇文章讲述的是8位飞思卡尔单片机的内存映射，这几天，研究了一下Codewarrior5.0prm 文件，基于16位单片机MC9S12XS128，一点心得，和大家分享。有什么错误请指正。

正文：

关于Codewarrior中的.prm文件

要讨论单片机的地址映射，就必须要接触.prm文件，本篇的讨论基于Codewarrior

5.0编译器，单片机采用MC9S12XS128。

通过项目模板建立的新项目中都有一个名字为“project.pr的m”文件，位于ProjectSettings-LinkerFiles文件夹下。一个标准的基于XS128的.prm文件起始内容如下：

.prm文件范例：NAMES

ENDSEGMENTS

RAM =

READ_WRITEDATA_NEAR 0x2000TO0x3FFF;

ROM_4000 =

READ_ONLY DATA_NEAR IBCC_NEAR 0x4000 TO 0x7FFF;

ROM_C000 =

READ_ONLY DATA_NEAR IBCC_NEAR 0xC000 TO 0xFEFF;

//OSVECTORS =READ_ONLY 0xFF10 TO 0xFFFF;

EEPROM_00 =READ_ONLY DATA_FAR

EEPROM_01 =READ_ONLY DATA_FAR

EEPROM_02 =READ_ONLY DATA_FAR

EEPROM_03 =READ_ONLY DATA_FAR

EEPROM_04 =READ_ONLY DATA_FAR

EEPROM_05 =READ_ONLY DATA_FAR

EEPROM_06 =READ_ONLY DATA_FAR

EEPROM_07 =READ_ONLY DATA_FAR

PAGE_F8 =READ_ONLY DATA_FAR

IBCC_FAR 0x000800

IBCC_FAR 0x010800

IBCC_FAR 0x020800

IBCC_FAR 0x030800

IBCC_FAR 0x040800

IBCC_FAR 0x050800

IBCC_FAR 0x060800

IBCC_FAR 0x070800

IBCC_FAR 0xF88000

TO 0x000BFF;

TO 0x010BFF;

TO 0x020BFF;

TO 0x030BFF;

TO 0x040BFF;

TO 0x050BFF;

TO 0x060BFF;

TO 0x070BFF;

TO 0xF8BFFF;

PAGE_F9

READ_ONLY

=

DATA_FAR

IBCC_FAR

0xF98000

TO

0xF9BFFF;

PAGE_FAREAD_ONLY

=DATA_FAR

IBCC_FAR

0xFA8000

TO

0xFABFFF;

PAGE_FBREAD_ONLY

=DATA_FAR

IBCC_FAR

0xFB8000

TO

0xFBBFFF;

PAGE_FCREAD_ONLY

=DATA_FAR

IBCC_FAR

0xFC8000

TO

0xFCBFFF;

PAGE_FEREAD_ONLY

=DATA_FAR

IBCC_FAR

0xFE8000

TO

0xFEBFFF;

END

PLACEMENT

_PRESTART,STARTUP,ROM_VAR,STRINGS,

VIRTUAL_TABLE_SEGMENT,

//.ostext,

DEFAULT_ROM,NON_BANKED,COPY

INTO ROM_C000;

OTHER_ROM INTO PAGE_FE,PAGE_FC,PAGE_FB,PAGE_FA,PAGE_F9,PAGE_F8;

//.stackstart,SSTACK,

//.stackend,PAGED_RAM,DEFAULT_RAM

INTO RAM;DISTRIBUTE DISTRIBUTE_INTO

ROM_4000,PAGE_FE,PAGE_FC,PAGE_FB,PAGE_FA,PAGE_F9,PAGE_F8;

CONST_DISTRIBUTE DISTRIBUTE_INTO

ROM_4000,PAGE_FE,PAGE_FC,PAGE_FB,PAGE_FA,PAGE_F9,PAGE_F8;

DATA_DISTRIBUTE DISTRIBUTE_INTO

RAM;

//.vectors INTO OSVECTORS;

ENDENTRIES

//_vectabOsBuildNumber_Os