LPC2888 datasheet(12/34 Pages) PHILIPS

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LPC2880_LPC2888_1

Preliminary data sheet

Rev. 01 — 22 June 2006

12 of 34

Philips Semiconductors

LPC2880; LPC2888

16/32-bit ARM microcontrollers with external memory interface

Functional description

6.1 Architectural overview

The LPC2880/LPC2888 includes an ARM7TDMI CPU with an 8 kB cache, an AMBA AHB

interfacing to high-speed on-chip peripherals and internal and external memory, and four

AMBA APBs for connection to other on-chip peripheral functions.

The LPC2880/LPC2888 includes a multi-layer AHB and four separate APBs, in order to

minimize interference between the USB controller, other DMA operations, and processor

activity. Bus masters include the ARM7 itself, the USB block, and the general purpose

DMA controller.

Lower speed peripheral functions are connected to the APB buses. The four AHB-to-APB

bridges interface the APB buses to the AHB bus.

6.1.1 ARM7TDMI processor

The ARM7TDMI is a general purpose 32-bit microprocessor that offers high performance

and very low power consumption. The ARM architecture is based on RISC principles, and

the instruction set and related decode mechanism are much simpler than those of

microprogrammed CISCs. This simplicity results in a high instruction throughput and

impressive real-time interrupt response from a small and cost-effective processor core.

Pipeline techniques are employed so that all parts of the processing and memory systems

can operate continuously. Typically, while one instruction is being executed, its successor

is being decoded, and a third instruction is being fetched from memory.

The ARM7TDMI processor also employs a unique architectural strategy known as Thumb,

which makes it ideally suited to high-volume applications with memory restrictions, or

applications where code density is an issue.

The key idea behind Thumb is that of a super-reduced instruction set. Essentially, the

ARM7TDMI processor has two instruction sets:

• The standard 32-bit ARM instruction set.

• A 16-bit Thumb instruction set.

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 down 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.

The ARM7TDMI processor is described in detail on the ARM web site.

6.1.2 On-chip ﬂash memory system

The LPC2880/LPC2888 includes a 1 MB 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 USB port. 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 ﬁrmware upgrades, etc.

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