參數(shù)資料
型號(hào)： LPC2939FBD208
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： ARM9 microcontroller with CAN, LIN, and USB
中文描述： 32-BIT, FLASH, 125 MHz, RISC MICROCONTROLLER, PQFP208
封裝： 28 X 28 MM, 1.40 MM HEIGHT, PLASTIC, SOT-459, MS-026, LQFP-208
文件頁數(shù)： 15/99頁
文件大小： 1945K
代理商： LPC2939FBD208
LPC2939_3
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 03 — 7 April 2010
15 of 99
NXP Semiconductors
LPC2939
ARM9 microcontroller with CAN, LIN, and USB
The ARM968E-S processor also employs a unique architectural strategy known as
THUMB, which makes it ideally suited to high-volume applications with memory
restrictions or to applications where code density is an issue.
The key idea behind THUMB is that of a super-reduced instruction set. Essentially, the
ARM968E-S processor has two instruction sets:
Standard 32-bit ARMv5TE set
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 controller using 16-bit registers. This is possible because THUMB code
operates on the same 32-bit register set as ARM code.
THUMB code can provide up to 65 % of the code size of ARM, and 160 % of the
performance of an equivalent ARM controller connected to a 16-bit memory system.
The ARM968E-S processor is described in detail in the ARM968E-S data sheet
Ref. 2
.
6.3 On-chip flash memory system
The LPC2939 includes a 768 kB flash memory system. This memory can be used for both
code and data storage. Programming of the flash memory can be accomplished via the
flash memory controller or the JTAG.
The flash controller also supports a 16 kB, byte-accessible on-chip EEPROM integrated
on the LPC2939.
6.4 On-chip static RAM
In addition to the two 32 kB TCMs the LPC2939 includes two static RAM memories: one
of 32 kB and one of 16 kB. Both may be used for code and/or data storage.
In addition, 8 kB SRAM for the ETB can be used as static memory for code and data
storage. However, DMA access to this memory region is not supported.
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