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參數(shù)資料
| 型號： | OM13032,598 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 17/74頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL LPC11U24 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | MCU |
| 適用于相關(guān)產(chǎn)品： | LPC11U24 |
| 所含物品： | 板 |
| 其它名稱： | 568-8599 |
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LPC11U2X
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 2.2 — 11 March 2014
24 of 74
NXP Semiconductors
LPC11U2x
32-bit ARM Cortex-M0 microcontroller
7.17.1.2
System oscillator
The system oscillator can be used as the clock source for the CPU, with or without using
the PLL. On the LPC11U2x, use the system oscillator to provide the clock source to USB.
The system oscillator operates at frequencies of 1 MHz to 25 MHz. This frequency can be
boosted to a higher frequency, up to the maximum CPU operating frequency, by the
system PLL.
7.17.1.3
Watchdog oscillator
The watchdog oscillator can be used as a clock source that directly drives the CPU, the
watchdog timer, or the CLKOUT pin. The watchdog oscillator nominal frequency is
programmable between 7.8 kHz and 1.7 MHz. The frequency spread over processing and
temperature is
40 % (see also Table 13).
7.17.2 System PLL and USB PLL
The LPC11U2x contain a system PLL and a dedicated PLL for generating the 48 MHz
USB clock. The system and USB PLLs are identical.
The PLL accepts an input clock frequency in the range of 10 MHz to 25 MHz. The input
frequency is multiplied up to a high frequency with a Current Controlled Oscillator (CCO).
The multiplier can be an integer value from 1 to 32. The CCO operates in the range of
156 MHz to 320 MHz. To support this frequency range, an additional divider keeps the
CCO within its frequency range while the PLL is providing the desired output frequency.
The output divider can be set to divide by 2, 4, 8, or 16 to produce the output clock. The
PLL output frequency must be lower than 100 MHz. Since the minimum output divider
value is 2, it is insured that the PLL output has a 50 % duty cycle. The PLL is turned off
and bypassed following a chip reset. Software can enable the PLL later. The program
must configure and activate the PLL, wait for the PLL to lock, and then connect to the PLL
as a clock source. The PLL settling time is 100
s.
7.17.3 Clock output
The LPC11U2x feature a clock output function that routes the IRC oscillator, the system
oscillator, the watchdog oscillator, or the main clock to an output pin.
7.17.4 Wake-up process
The LPC11U2x begin operation by using the 12 MHz IRC oscillator as the clock source at
power-up and when awakened from Deep power-down mode. This mechanism allows
chip operation to resume quickly. If the application uses the main oscillator or the PLL,
software must enable these components and wait for them to stabilize. Only then can the
system use the PLL and main oscillator as a clock source.
7.17.5 Power control
The LPC11U2x support various power control features. There are four special modes of
processor power reduction: Sleep mode, Deep-sleep mode, Power-down mode, and
Deep power-down mode. The CPU clock rate can also be controlled as needed by
changing clock sources, reconfiguring PLL values, and/or altering the CPU clock divider
value. This power control mechanism allows a trade-off of power versus processing speed
based on application requirements. In addition, a register is provided for shutting down the
clocks to individual on-chip peripherals. This register allows fine-tuning of power
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OM13033 | 制造商:NXP Semiconductors 功能描述:EVAL ARM NGX LPC11U24 制造商:NXP Semiconductors 功能描述:LPC11U24, NGX, KEIL, EVAL BOARD 制造商:NXP Semiconductors 功能描述:LPC11U24, NGX, KEIL, EVAL BOARD; Silicon Manufacturer:NXP; Core Architecture:ARM; Core Sub-Architecture:Cortex-M0; Silicon Core Number:LPC11xxx; Silicon Family Name:LPC11Uxx; Features:Evaluation Board for LPC11U24 Microcontroller; ;RoHS Compliant: Yes |
| OM13033,598 | 功能描述:開發(fā)板和工具包 - ARM NGX LPC11U24 Eval Board RoHS:否 制造商:Arduino 產(chǎn)品:Development Boards 工具用于評估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口類型:DAC, ICSP, JTAG, UART, USB 工作電源電壓:3.3 V |
| OM13033598 | 制造商:NXP Semiconductors 功能描述:EVAL ARM NGX LPC11U24 |
| OM13034,598 | 制造商:NXP Semiconductors 功能描述:EVAL, IAR, LPC1347, J-LINK LITE 制造商:NXP Semiconductors 功能描述:EVAL, IAR, LPC1347, J-LINK LITE, Silicon Manufacturer:NXP, Core Architecture:ARM 制造商:NXP Semiconductors 功能描述:EVAL, IAR, LPC1347, J-LINK LITE, Silicon Manufacturer:NXP, Core Architecture:ARM, Core Sub-Architecture:Cortex-M3, Silicon Core Number:LPC1347, Silicon Family Name:LPC1300, Kit Contents:Evaluation Board for LPC1347 , RoHS Compliant: Yes |
| OM13034598 | 制造商:NXP Semiconductors 功能描述:EVAL IAR LPC1347 J-LINK LITE |
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