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參數(shù)資料
| 型號(hào)： | LPC2478FBD208 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 數(shù)學(xué)處理器 |
| 英文描述： | Single-chip 16-bit-32-bit micro; 512 kB flash, Ethernet, CAN, LCD, USB 2.0 device-host-OTG, external memory interface |
| 封裝： | LPC2478FBD208<SOT459-1 (LQFP208)|<<http://www.nxp.com/packages/SOT459-1.html<1<Always Pb-free,;LPC2478FET208<SOT950-1 (TFBGA208)|<<http://www.nxp.com/packages/SOT950-1.ht |
| 文件頁數(shù)： | 45/93頁 |
| 文件大小： | 751K |
| 代理商： | LPC2478FBD208 |
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LPC2478
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 12 September 2011
45 of 93
NXP Semiconductors
LPC2478
Single-chip 16-bit/32-bit microcontroller
The VBAT pin supplies power only to the RTC and the Battery RAM. These two functions
require a minimum of power to operate, which can be supplied by an external battery.
When the CPU and the rest of chip functions are stopped and power removed, the RTC
can supply an alarm output that can be used by external hardware to restore chip power
and resume operation.
7.25.1
Features
Measures the passage of time to maintain a calendar and clock.
Ultra low power design to support battery powered systems.
Provides Seconds, Minutes, Hours, Day of Month, Month, Year, Day of Week, and
Day of Year.
Dedicated 32 kHz oscillator or programmable prescaler from APB clock.
Dedicated power supply pin can be connected to a battery or to the main 3.3 V.
An alarm output pin is included to assist in waking up when the chip has had power
removed to all functions except the RTC and Battery RAM.
Periodic interrupts can be generated from increments of any field of the time registers,
and selected fractional second values. This enhancement enables the RTC to be
used as a System Timer.
2 kB data SRAM powered by VBAT.
RTC and Battery RAM power supply is isolated from the rest of the chip.
7.26 Clocking and power control
7.26.1
Crystal oscillators
The LPC2478 includes three independent oscillators. These are the Main Oscillator, the
Internal RC oscillator, and the RTC oscillator. Each oscillator can be used for more than
one purpose as required in a particular application. Any of the three clock sources can be
chosen by software to drive the PLL and ultimately the CPU.
Following reset, the LPC2478 will operate from the Internal RC oscillator until switched by
software. This allows systems to operate without any external crystal and the bootloader
code to operate at a known frequency.
7.26.1.1
Internal RC oscillator
The IRC may be used as the clock source for the WDT, and/or as the clock that drives the
PLL and subsequently the CPU. The nominal IRC frequency is 4 MHz. The IRC is
trimmed to 1 % accuracy.
Upon power-up or any chip reset, the LPC2478 uses the IRC as the clock source.
Software may later switch to one of the other available clock sources.
7.26.1.2
Main oscillator
The main oscillator can be used as the clock source for the CPU, with or without using the
PLL. The main 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
PLL. The clock selected as the PLL input is PLLCLKIN. The ARM processor clock
frequency is referred to as CCLK elsewhere in this document. The frequencies of
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| LPC2478FBD208,551 | 功能描述:ARM微控制器 - MCU LCD CONT/ETHNET USB/512K FL 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(shí)鐘頻率:72 MHz 程序存儲(chǔ)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 |
| LPC2478FBD208,551 | 制造商:NXP Semiconductors 功能描述:IC, 32BIT MCU, 72MHZ, LQFP-208 |
| LPC2478FBD208551 | 制造商:NXP Semiconductors 功能描述:MCU ARM7 208LQFP |
| LPC2478FBD208551 | 制造商:NXP Semiconductors 功能描述:IC 32BIT MCU 72MHZ LQFP-208 |
| LPC2478FET,208 | 制造商:NXP Semiconductors 功能描述: |
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