參數(shù)資料
型號: LPC2157FBD100
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: Single-chip 16-bit-32-bit microcontrollers; 512 kB flash, with 32 segment x 4 LCD driver
中文描述: 32-BIT, FLASH, 60 MHz, RISC MICROCONTROLLER, PQFP100
封裝: 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT407-1, LQFP-100
文件頁數(shù): 15/45頁
文件大?。?/td> 220K
代理商: LPC2157FBD100
LPC2157_2158_2
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 9 February 2009
15 of 45
NXP Semiconductors
LPC2157/2158
Single-chip 16-bit/32-bit microcontrollers
6.
Functional description
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 (CISC). 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 LPC2157/2158 incorporate a 512 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.
Due to the architectural solution chosen for an on-chip bootloader, flash memory available
for user’s code on LPC2157/2158 is 500 kB respectively.
The LPC2157/2158 flash memory provides a minimum of 400000 erase/write cycles and
20 years of data-retention.
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-bit, 16-bit, and 32-bit. The LPC2157/2158 provide 32 kB and 40 kB of
static RAM.
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LPC2158FBD100 Single-chip 16-bit-32-bit microcontrollers; 512 kB flash, with 32 segment x 4 LCD driver
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