Ryang 寫道:
18F452的ROM宣告位是從多少開始:
0x0000 ~ 0x7FFFF
===>這個ROM空間是不是程式位址的空間
這是範例:
/* define the LCD_MSG1[] in program memory at 0x1000 */
//*****************************************************
#pragma romdata My_romdata=0x1000
const rom char LCD_MSG1[]=" C18 Workshop ";
const rom char LCD_MSG2[]="A/D Result = ";

const rom far char Disp_Msg1[]="MPLAB-C18 Workshop";
const rom far char Disp_Msg2[]="Motor is Running !";
const rom far char Disp_Msg3[]="Motor is Stopped !";
const rom far char Disp_Msg4[]="Current Motor Speed are : ";
#pragma romdata



EEPROM宣告位是從多少開始:
EEPROM 有它自己的獨立空間不佔位址，但用 ICSP 燒錄時的位只是在 0xF00000~0xF000FF
===>這是不是各種型號有所不同
這也是範例
while(1) // loop here until read the NULL from EEPROM
{
EE_Read_Data.l = EERandomRead(0xA0,j); // Read data from EEPROM

if (EE_Read_Data.i[0]!=NULL) // check NULL data?
{
WriteDataLCD(EE_Read_Data.i[0]); // No, display the data to LCD
j++; // Point to next address of EEPROM
}

RAM宣告位是從多少開始:
從 0x000 ~ 0xFFF 最大4K Bytes
範例:
/* define the LCD_MSG2[] in data memory at 0x100 */
//*************************************************
#pragma idata My_Banked_RAM=0x100
char LCD_MSG2[]="A/D Result = ";
#pragma idata

/* define following variable in data memory at Access Bank */
//***********************************************************
#pragma udata access My_Access_RAM