LPC2119 Просмотр технического описания (PDF) - Philips Electronics

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LPC2119

Single-chip 16/32-bit microcontrollers; 128/256 kB ISP/IAP Flash with 10-bit ADC and CAN

Philips Electronics 

Philips Semiconductors

LPC2119/LPC2129

Single-chip 16/32-bit microcontrollers

6. Functional description

Details of the LPC2119/LPC2129 systems and peripheral functions are described in

the following sections.

6.1 Architectural overview

The ARM7TDMI-S is a general purpose 32-bit microprocessor, which offers high

performance and very low power consumption. The ARM architecture is based on

Reduced Instruction Set Computer (RISC) principles, and the instruction set and

related decode mechanism are much simpler than those of microprogrammed

Complex Instruction Set Computers. 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-S 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-S processor has two instruction sets:

• The standard 32-bit ARM set.

• A 16-bit THUMB 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 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.

6.2 On-Chip Flash program memory

The LPC2119/LPC2129 incorporate a 128 kB and 256 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. 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. When on-chip bootloader is

used, 120/248 kB of Flash memory is available for user code.

6.3 On-Chip static RAM

On-Chip static RAM may be used for code and/or data storage. The SRAM may be

accessed as 8-bits, 16-bits, and 32-bits. The LPC2119/LPC2129 provide 16 kB of

static RAM.

9397 750 12806

Preliminary data

Rev. 02 — 02 February 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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