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參數(shù)資料
| 型號： | LPC2212 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 16/32-bit ARM microcontrollers; 128/256 kB ISP/IAP Flash with 10-bit ADC and external memory interface |
| 中文描述： | 16/32位ARM微控制器; 128/256 kB ISP / IAP閃存的10位模數(shù)轉(zhuǎn)換器和外部存儲器接口 |
| 文件頁數(shù)： | 25/40頁 |
| 文件大?。?/td> | 185K |
| 代理商： | LPC2212 |
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Philips Semiconductors
LPC2212/LPC2214
16/32-bit ARM microcontrollers with external memory interface
Product data
Rev. 02 — 23 December 2004
25 of 40
9397 750 13149
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
6.20 System control
6.20.1
Crystal oscillator
The oscillator supports crystals in the range of 1 MHz to 30 MHz. The oscillator
output frequency is called f
osc
and the ARM processor clock frequency is referred to
as cclk for purposes of rate equations, etc. f
osc
and cclk are the same value unless
the PLL is running and connected. Refer to
Section 6.20.2 “PLL”
for additional
information.
6.20.2
PLL
The PLL accepts an input clock frequency in the range of 10 MHz to 25 MHz. The
input frequency is multiplied up into the range of 10 MHz to 60 MHz with a Current
Controlled Oscillator (CCO). The multiplier can be an integer value from 1 to 32 (in
practice, the multiplier value cannot be higher than 6 on this family of microcontrollers
due to the upper frequency limit of the CPU). The CCO operates in the range of
156 MHz to 320 MHz, so there is an additional divider in the loop to keep the CCO
within its frequency range while the PLL is providing the desired output frequency.
The output divider may be set to divide by 2, 4, 8, or 16 to produce the output clock.
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 and may
be enabled by software. The program must configure and activate the PLL, wait for
the PLL to Lock, then connect to the PLL as a clock source. The PLL settling time is
100
μ
s.
6.20.3
Reset and wake-up timer
Reset has two sources on the LPC2212/LPC2214: the RESET pin and Watchdog
Reset. The RESET pin is a Schmitt trigger input pin with an additional glitch filter.
Assertion of chip Reset by any source starts the Wake-up Timer (see Wake-up Timer
description below), causing the internal chip reset to remain asserted until the
external Reset is de-asserted, the oscillator is running, a fixed number of clocks have
passed, and the on-chip Flash controller has completed its initialization.
When the internal Reset is removed, the processor begins executing at address 0,
which is the Reset vector. At that point, all of the processor and peripheral registers
have been initialized to predetermined values.
The wake-up timer ensures that the oscillator and other analog functions required for
chip operation are fully functional before the processor is allowed to execute
instructions. This is important at power on, all types of Reset, and whenever any of
the aforementioned functions are turned off for any reason. Since the oscillator and
other functions are turned off during Power-down mode, any wake-up of the
processor from Power-down mode makes use of the Wake-up Timer.
The Wake-up Timer monitors the crystal oscillator as the means of checking whether
it is safe to begin code execution. When power is applied to the chip, or some event
caused the chip to exit Power-down mode, some time is required for the oscillator to
produce a signal of sufficient amplitude to drive the clock logic. The amount of time
depends on many factors, including the rate of V
DD
ramp (in the case of power on),
the type of crystal and its electrical characteristics (if a quartz crystal is used), as well
as any other external circuitry (e.g. capacitors), and the characteristics of the
oscillator itself under the existing ambient conditions.
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PDF描述 |
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| LPC2214 | 16/32-bit ARM microcontrollers; 128/256 kB ISP/IAP Flash with 10-bit ADC and external memory interface |
| LPC2220 | 16/32-bit ARM microcontrollers; flashless with 64 kB, with 10-bit ADC and external memory interface |
| LPC2364FB100 | Single-chip 16-bit/32-bit microcontrollers; up to 512 kB flash with ISP/IAP, Ethernet, USB 2.0, CAN, and 10-bit ADC/DAC |
| LPC2364 | Single-chip 16-bit/32-bit microcontrollers; up to 512 kB flash with ISP/IAP, Ethernet, USB 2.0, CAN, and 10-bit ADC/DAC |
| LPC2366 | Single-chip 16-bit/32-bit microcontrollers; up to 512 kB flash with ISP/IAP, Ethernet, USB 2.0, CAN, and 10-bit ADC/DAC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LPC2212_08 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:16/32-bit ARM microcontrollers; 128/256 kB ISP/IAP flash with 10-bit ADC and external memory interface |
| LPC2212_11 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 16/32-bit ARM microcontrollers; 128/256 kB ISP/IAP flash with 10-bit ADC |
| LPC2212FBD101 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 16/32-bit ARM microcontrollers; 128/256 kB ISP/IAP flash with 10-bit ADC |
| LPC2212FBD144 | 制造商:NXP Semiconductors 功能描述:16/32BIT MCU ARM7 128K FLASH 144LQFP 制造商:NXP Semiconductors 功能描述:16/32BIT MCU ARM7, 128K FLASH, 144LQFP |
| LPC2212FBD144,551 | 功能描述:ARM微控制器 - MCU PREF PART LPC2212FBD144/01-S 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 |
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