It is divided into three major CODE storage areas:
upgrade program area + user program area + user Main entry address storage area
Reset 0x0000-0x0003 address to save LJMP main command
For example,
C:0x0000 02F741 LJMP STARTUP1(C:F741)
0x0000 – 0x0003 stores 02F741, where 02 is the LJMP command code, and F741 is the jump address (main), which is actually not the address of main. Before main, it also protects the stack initialization code (you can see it through assembly).
The addresses after 0x0003 are various interrupt addresses. For example, the address of the SMBUS interrupt function
void SMBUS_ISR (void) interrupt 7
{
} SMBUS_ISR in your program is stored at 0x003B. A program is actually composed of interrupt vector + user code program. The interrupt vector is in the first sector. For KEIL, unless the function address is specifically specified, the compiler will automatically assign the function address after the program is written. That is to say, the address in the interrupt vector may change after the modification and compilation. For KEIL, the address of the program code can be specified, but this address is the user code address. For example, in Option For Target -àBL Loate -à code Range 0XEA00-0XFDFF Actual code area: Interrupt vector (first sector) + 0XEA00-0XFDFF
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