Nxp Semiconductors UM10237 用户手册

UM10237_2

© NXP B.V. 2008. All rights reserved.

The basic concept on the LPC2400 is that each memory area has a "natural" location in 
the memory map. This is the address range for which code residing in that area is written. 
The bulk of each memory space remains permanently fixed in the same location, 
eliminating the need to have portions of the code designed to run in different address 
ranges.

Because of the location of the interrupt vectors on the ARM7 processor (at addresses 
0x0000 0000 through 0x0000 001C, as shown in 

 below), a small portion of the 

Boot ROM and SRAM spaces need to be re-mapped in order to allow alternative uses of 
interrupts in the different operating modes described in 

. Re-mapping of the 

interrupts is accomplished via the Memory Mapping Control feature (

 

0x0000 0000

Reset

0x0000 0004

Undefined Instruction

0x0000 0008

Software Interrupt

0x0000 000C

Prefetch Abort (instruction fetch memory fault)

0x0000 0010

Data Abort (data access memory fault)

0x0000 0014

Reserved
Note: Identified as reserved in ARM documentation, this location is used 
by the Boot Loader as the Valid User Program key when booting from 
on-chip flash memory. This is described in detail in 

.

0x0000 0018

IRQ

0x0000 001C

FIQ