LPC2194JBD64 Philips Semiconductors (Acquired by NXP), LPC2194JBD64 Datasheet - Page 9

• Manufacturer Part Number: LPC2194JBD64
• Description: Single-chip 16/32-bit Microcontrollers; 256 KB Isp/iap Flash With 10-bit ADC And CAN.the LPC2194 is Based on a 16/32 Bit ARM7TDMI-STM Cpu With Real-time Emulation And Embedded Trace Support, Together With 256 Kilobytes (kB) of Embedded High Speed Fla
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
6. Functional description
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Preliminary data
6.1 Architectural overview
6.2 On-Chip Flash program memory
6.3 On-Chip static RAM
Details of the LPC2194 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 LPC2194 incorporates a 256 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.
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, 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 LPC2194 provides 16 kB of static RAM.
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The standard 32-bit ARM set.
A 16-bit THUMB set.
Rev. 01 — 06 February 2004
Single-chip 16/32-bit microcontrollers
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
LPC2194
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