LPC2387 datasheet(14/47 Pages) NXP

14 / 47 page

LPC2387_1

Product data sheet

Rev. 01.00 — 6 November 2007

14 of 47

NXP Semiconductors

LPC2387

Fast communication chip

The Thumb set’s 16-bit instruction length allows it to approach twice the density of

standard ARM code while retaining most of the ARM’s performance advantage over a

traditional 16-bit processor using 16-bit registers. This is possible because Thumb code

operates on the same 32-bit register set as ARM code.

Thumb code is able to provide up to 65 % of the code size of ARM, and 160 % of the

performance of an equivalent ARM processor connected to a 16-bit memory system.

7.2 On-chip flash programming memory

The LPC2387 incorporates a 512 kB flash memory system respectively. 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 SRAM speeds of 72 MHz.

The LPC2387 provides a minimum of 100000 write/erase cycles and 20 years of data

retention.

7.3 On-chip SRAM

The LPC2387 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 an 16 kB SRAM

associated with the USB device can be used both for data and code storage, too. 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 LPC2387 memory map incorporates several distinct regions as shown in 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 7.25.6).

LPC2387 Datasheet(PDF) 14 Page - NXP Semiconductors