LPC2468 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 6.2 — 11 January 2013 25 of 85
NXP Semiconductors
LPC2468
Single-chip 16-bit/32-bit micro
The Thumb set’s 16-bit instruction length allows it to approach higher density compared to
standard ARM code while retaining most of the ARM’s performance.
7.2 On-chip flash programming memory
The LPC2468 incorporates 512 kB flash memory system. This memory may be used for
both code and data storage. Programming of the flash memory may be accomplished in
several ways. It may be programmed In System via the serial port (UART0). The
application program may also erase and/or program the flash while the application is
running, allowing a great degree of flexibility for data storage field and firmware upgrades.
The flash memory is 128 bits wide and includes pre-fetching and buffering techniques to
allow it to operate at speeds of 72 MHz.
7.3 On-chip SRAM
The LPC2468 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 LPC2468 memory map incorporates several distinct regions as shown in Table 5 and
Figure 4
.
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. LPC2468 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 - 0x0007 FFFF flash memory (512 kB)
0x3FFF C000 - 0x3FFF FFFF fast GPIO registers
0x4000 0000 to
0x7FFF FFFF
on-chip RAM 0x4000 0000 - 0x4000 FFFF RAM (64 kB)
0x7FE0 0000 - 0x7FE0 3FFF Ethernet RAM (16 kB)
0x7FD0 0000 - 0x7FD0 3FFF USB RAM (16 kB)
