LPC2119 Philips Semiconductors (Acquired by NXP), LPC2119 Datasheet - Page 9

• Manufacturer Part Number: LPC2119
• Description: Single-chip 16/32-bit Microcontrollers; 128/256 KB Isp/iap Flash With 10-bit ADC And CANthe LPC2119/LPC2129 Are Based on a 16/32 Bit ARM7TDMI-STM Cpu With Real-time Emulation And Embedded Trace Support, Together With 128/256 Kilobytes (kB) of Embedde
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
6. Functional description
9397 750 12806
Preliminary data
6.1 Architectural overview
6.2 On-Chip Flash program memory
6.3 On-Chip static RAM
Details of the LPC2119/LPC2129 systems and peripheral functions are described in
the following sections.
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 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.
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.
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.
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The standard 32-bit ARM set.
A 16-bit THUMB set.
Rev. 02 — 02 February 2004
Single-chip 16/32-bit microcontrollers
LPC2119/LPC2129
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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