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| 型號： | LPC2378 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Single-chip 16-bit/32-bit microcontrollers; 512 kB flash with ISP/IAP, Ethernet, USB 2.0, CAN, and 10-bit ADC/DAC |
| 中文描述： | 單芯片16-bit/32-bit微控制器，512的ISP /國際檢察官聯(lián)合會，以太網(wǎng)，USB 2.0，CAN和10 kB閃存位的ADC / DAC |
| 文件頁數(shù)： | 33/54頁 |
| 文件大?。?/td> | 203K |
| 代理商： | LPC2378 |
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LPC2378_1
NXP B.V. 2006. All rights reserved.
Preliminary data sheet
Rev. 01 — 6 December 2006
33 of 54
NXP Semiconductors
LPC2378
Fast communication chip
7.26 System control
7.26.1
Reset
Reset has four sources on the LPC2378: the RESET pin, the Watchdog reset, power-on
reset, and the BrownOut Detection (BOD) circuit. The RESET pin is a Schmitt trigger input
pin. Assertion of chip Reset by any source, once the operating voltage attains a usable
level, starts the Wake-up timer (see description in
Section 7.25.3 “Wake-up timer”
),
causing reset to remain asserted until the external Reset is de-asserted, the oscillator is
running, a fixed number of clocks have passed, and the flash controller has completed its
initialization.
When the internal Reset is removed, the processor begins executing at address 0, which
is initially the Reset vector mapped from the Boot Block. At that point, all of the processor
and peripheral registers have been initialized to predetermined values.
7.26.2
Brownout detection
The LPC2378 includes 2-stage monitoring of the voltage on the V
DD(3V3)
pins. If this
voltage falls below 2.95 V, the BOD asserts an interrupt signal to the Vectored Interrupt
Controller. This signal can be enabled for interrupt in the Interrupt Enable Register in the
VIC in order to cause a CPU interrupt; if not, software can monitor the signal by reading a
dedicated status register.
The second stage of low-voltage detection asserts Reset to inactivate the LPC2378 when
the voltage on the V
DD(3V3)
pins falls below 2.65 V. This Reset prevents alteration of the
flash as operation of the various elements of the chip would otherwise become unreliable
due to low voltage. The BOD circuit maintains this reset down below 1 V, at which point
the power-on reset circuitry maintains the overall Reset.
Both the 2.95 V and 2.65 V thresholds include some hysteresis. In normal operation, this
hysteresis allows the 2.95 V detection to reliably interrupt, or a regularly-executed event
loop to sense the condition.
7.26.3
Code security
This feature of the LPC2378 allows an application to control whether it can be debugged
or protected from observation.
If after reset the on-chip bootloader detects a valid checksum in flash and reads
0x8765 4321 from address 0x1FC in flash, debugging will be disabled and thus the code
in flash will be protected from observation. Once debugging is disabled, it can be enabled
by performing a full chip erase using the ISP.
7.26.4
AHB bus
The LPC2378 implements two AHB buses in order to allow the Ethernet block to operate
without interference caused by other system activity. The primary AHB, referred to as
AHB1, includes the Vectored Interrupt Controller, GPDMA controller, USB interface, and
8 kB SRAM primarily intended for use by the USB.
The second AHB, referred to as AHB2, includes only the Ethernet block and an
associated 16 kB SRAM. In addition, a bus bridge is provided that allows the secondary
AHB to be a bus master on AHB1, allowing expansion of Ethernet buffer space into
off-chip memory or unused space in memory residing on AHB1.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LPC2378FBD144 | 制造商:NXP Semiconductors 功能描述:MCU 32BIT ARM7 10/100 USB CAN 制造商:NXP Semiconductors 功能描述:MCU 32BIT ARM7, 10/100, USB, CAN |
| LPC2378FBD144,551 | 功能描述:ARM微控制器 - MCU ARM7 512KF/USB/ENET 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 |
| LPC2378FBD144/CP32 | 制造商:NXP Semiconductors 功能描述:- Trays |
| LPC2378FBD144/CP3E | 制造商:NXP Semiconductors 功能描述: |
| LPC2378FBD144551 | 制造商:NXP Semiconductors 功能描述:IC 32BIT MCU ARM7 72MHZ LQFP-144 |
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