飞思卡尔单片机编程

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Codewarrior 5.0 prm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.prm”的文件，位于Project Settings->Linker Files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

END

SEGMENTS

RAM = READ_WRITE DATA_NEAR 0x2000 TO 0x3FFF;

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 IBCC_FAR 0x000800 TO 0x000BFF;

EEPROM_01 = READ_ONLY DATA_FAR IBCC_FAR 0x010800 TO 0x010BFF;

EEPROM_02 = READ_ONLY DATA_FAR IBCC_FAR 0x020800 TO 0x020BFF;

EEPROM_03 = READ_ONLY DATA_FAR IBCC_FAR 0x030800 TO 0x030BFF;

EEPROM_04 = READ_ONLY DATA_FAR IBCC_FAR 0x040800 TO 0x040BFF;

EEPROM_05 = READ_ONLY DATA_FAR IBCC_FAR 0x050800 TO 0x050BFF;

EEPROM_06 = READ_ONLY DATA_FAR IBCC_FAR 0x060800 TO 0x060BFF;

EEPROM_07 = READ_ONLY DATA_FAR IBCC_FAR 0x070800 TO 0x070BFF;

PAGE_F8 = READ_ONLY DATA_FAR IBCC_FAR 0xF88000 TO 0xF8BFFF;

PAGE_F9 = READ_ONLY DATA_FAR IBCC_FAR 0xF98000 TO 0xF9BFFF;

PAGE_FA = READ_ONLY DATA_FAR IBCC_FAR 0xFA8000 TO 0xFABFFF;

PAGE_FB = READ_ONLY DATA_FAR IBCC_FAR 0xFB8000 TO 0xFBBFFF;

PAGE_FC = READ_ONLY DATA_FAR IBCC_FAR 0xFC8000 TO 0xFCBFFF;

PAGE_FE = READ_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;

END

ENTRIES

本文来源：https://www.bwwdw.com/article/xv92.html