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參數(shù)資料
| 型號： | LPC3220FET296 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | ARM926EJ-S with 128 kB SRAM, USB High-speed OTG, SD-MMC, NAND flash controller |
| 中文描述： | 32-BIT, FLASH, 266 MHz, RISC MICROCONTROLLER, PBGA296 |
| 封裝： | 15 X 15 MM, 0.70 MM PITCH, PLASTIC, MO-216, SOT1048-1, TFBGA-296 |
| 文件頁數(shù)： | 35/79頁 |
| 文件大?。?/td> | 599K |
| 代理商： | LPC3220FET296 |
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LPC3220_30_40_50
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 20 October 2011
35 of 79
NXP Semiconductors
LPC3220/30/40/50
16/32-bit ARM microcontrollers
7.7.4
Clocking and power control features
7.7.4.1
Clocking
Clocking in the LPC3220/30/40/50 is designed to be versatile, so that system and
peripheral requirements may be met, while allowing optimization of power consumption.
Clocks to most functions may be turned off if not needed and some peripherals do this
automatically.
The LPC3220/30/40/50 supports three operational modes, two of which are specifically
designed to reduce power consumption. The modes are: Run mode, Direct run mode, and
Stop mode.These three operational modes give control over processing speed and power
consumption. In addition, clock rates to different functional blocks may be changed by
switching clock sources, changing PLL values, or altering clock divider configurations.
This allows a trade-off of power versus processing speed based on application
requirements.
7.7.4.2
Crystal oscillator
The main oscillator is the basis for the clocks most chip functions use by default.
Optionally, many functions can be clocked instead by the output of a PLL (with a fixed
397x rate multiplication) which runs from the RTC oscillator. In this mode, the main
oscillator may be turned off unless the USB interface is enabled. If a SYSCLK frequency
other than 13 MHz is required in the application, or if the USB block is not used, the main
oscillator may be used with a frequency of between 1 MHz and 20 MHz.
7.7.4.3
PLLs
The LPC3220/30/40/50 includes three PLLs: The 397x PLL allows boosting the RTC
frequency to 13.008896 MHz for use as the primary system clock. The USB PLL provides
the 48 MHz clock required by the USB block, and the HCLK PLL provides the basis for the
CPU clock, the AHB bus clock, and the main peripheral clock.
The 397x PLL multiplies the 32768 Hz RTC clock by 397 to obtain a 13.008896 MHz
clock. The 397x PLL is designed for low power operation and low jitter. This PLL requires
an external RC loop filter for proper operation.
The HCLK PLL accepts an input clock from either the main oscillator or the output of the
397x PLL. The USB PLL only accepts an input clock from the main oscillator.The USB
input clock runs through a divide-by-N pre-divider before entering the USB PLL.
The input to the HCLK and USB PLLs may initially be divided down by a pre-divider value
‘N’, which may have the values 1, 2, 3, or 4. This pre-divider can allow a greater number of
possibilities for the output frequency. Following the PLL input divider is the PLL multiplier.
This can multiply the pre-divider output by a value ‘M’, in the range of 1 through 256. The
resulting frequency must be in the range of 156 MHz to 320 MHz. The multiplier works by
dividing the output of a Current Controlled Oscillator (CCO) by the value of M, then using
a phase detector to compare the divided CCO output to the pre-divider output. The error
value is used to adjust the CCO frequency.
At the PLL output, there is a post-divider that can be used to bring the CCO frequency
down to the desired PLL output frequency. The post-divider value can divide the CCO
output by 1, 2, 4, 8, or 16. The post-divider can also be bypassed, allowing the PLL CCO
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LPC3220FET296,551 | 功能描述:ARM微控制器 - MCU ARM9 128KRAM VFP USB OTG RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT |
| LPC3220FET296/01,5 | 功能描述:ARM微控制器 - MCU ARM9 VFP USB OTG Improved LCD RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT |
| LPC3220FET296/01,551 | 制造商:NXP Semiconductors 功能描述:0 |
| LPC3230 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:16/32-bit ARM microcontrollers; hardware floating-point coprocessor, USB On-The-Go, and EMC memory interface |
| LPC3230FET296 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:16/32-bit ARM microcontrollers; hardware floating-point coprocessor, USB On-The-Go, and EMC memory interface |
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