Datasheet

LPC2458 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 4.1 — 15 October 2013 22 of 81
NXP Semiconductors
LPC2458
Single-chip 16-bit/32-bit micro
7.3 On-chip SRAM
The LPC2458 includes a SRAM memory of 64 kB reserved for the ARM processor
exclusive use. This RAM may be used for code and/or data storage and may be accessed
as 8 bits, 16 bits, and 32 bits.
A 16 kB SRAM block serving as a buffer for the Ethernet controller and a 16 kB SRAM
associated with the second AHB can be used both for data and code storage. The 2 kB
RTC SRAM can be used for data storage only. The RTC SRAM is battery powered and
retains the content in the absence of the main power supply.
7.4 Memory map
The LPC2458 memory map incorporates several distinct regions as shown in Table 5 and
Figure 3
.
In addition, the CPU interrupt vectors may be remapped to allow them to reside in either
flash memory (default), boot ROM, or SRAM (see Section 7.26.6
).
Table 5. LPC2458 memory usage and details
Address range General use Address range details and description
0x0000 0000 to
0x3FFF FFFF
on-chip
non-volatile
memory and fast
I/O
0x0000 0000 to 0x0007 FFFF flash memory (512 kB)
0x3FFF C000 to 0x3FFF FFFF fast GPIO registers
0x4000 0000 to
0x7FFF FFFF
on-chip RAM 0x4000 0000 to 0x4000 FFFF RAM (64 kB)
0x7FE0 0000 to 0x7FE0 3FFF Ethernet RAM (16 kB)
0x7FD0 0000 to 0x7FD0 3FFF USB RAM (16 kB)
0x8000 0000 to
0xBFFF FFFF
off-chip memory two static memory banks, 1 MB each
0x8000 0000 to 0x800F FFFF static memory bank 0
0x8100 0000 to 0x810F FFFF static memory bank 1
two dynamic memory banks, 256 MB each
0xA000 0000 to 0xAFFF FFFF dynamic memory bank 0
0xB000 0000 to 0xBFFF FFFF dynamic memory bank 1
0xE000 0000 to
0xEFFF FFFF
APB peripherals 36 peripheral blocks, 16 kB each
0xF000 0000 to
0xFFFF FFFF
AHB peripherals