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| 型号： | OM11048 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 17/74页 |
| 文件大小： | 0K |
| 描述： | BOARD LPCXPRESSO LPC1343 |
| 产品培训模块： | LPCXpresso |
| 标准包装： | 1 |
| 系列： | LPCXpresso |
| 类型： | MCU |
| 适用于相关产品： | LPC1343 |
| 所含物品： | 板，软件 |
| 其它名称： | 568-4947 |
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LPC1311_13_42_43
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 5 — 6 June 2012
24 of 74
NXP Semiconductors
LPC1311/13/42/43
32-bit ARM Cortex-M3 microcontroller
Selectable time period from (Tcy(WDCLK)
× 256 × 4) to (Tcy(WDCLK) × 224 × 4) in
multiples of Tcy(WDCLK)
× 4.
The Watchdog Clock (WDCLK) source can be selected from the Internal RC oscillator
(IRC), the watchdog oscillator, or the main clock. This gives a wide range of potential
timing choices of watchdog operation under different power reduction conditions. It
also provides the ability to run the WDT from an entirely internal source that is not
dependent on an external crystal and its associated components and wiring for
increased reliability.
7.17 Windowed WatchDog Timer (WWDT)
Remark: The windowed watchdog timer is available on parts LPC1311/01 and
LPC1313/01.
The purpose of the watchdog is to reset the controller if software fails to periodically
service it within a programmable time window.
7.17.1 Features
Internally resets chip if not periodically reloaded during the programmable time-out
period.
Optional windowed operation requires reload to occur between a minimum and
maximum time period, both programmable.
Optional warning interrupt can be generated at a programmable time prior to
watchdog time-out.
Enabled by software but requires a hardware reset or a watchdog reset/interrupt to be
disabled.
Incorrect feed sequence causes reset or interrupt if enabled.
Flag to indicate watchdog reset.
Programmable 24-bit timer with internal prescaler.
Selectable time period from (Tcy(WDCLK)
× 256 × 4) to (Tcy(WDCLK) × 224 × 4) in
multiples of Tcy(WDCLK)
× 4.
The Watchdog Clock (WDCLK) source can be selected from the IRC or the dedicated
watchdog oscillator (WDO). This gives a wide range of potential timing choices of
watchdog operation under different power conditions.
7.18 Clocking and power control
7.18.1 Integrated oscillators
The LPC1311/13/42/43 include three independent oscillators. These are the system
oscillator, the Internal RC oscillator (IRC), and the watchdog oscillator. Each oscillator can
be used for more than one purpose as required in a particular application.
Following reset, the LPC1311/13/42/43 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.
See Figure 7 for an overview of the LPC1311/13/42/43 clock generation.
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| OM11048,598 | 功能描述:开发板和工具包 - ARM EA LPCXpresso brd for LPC1343 RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V |
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| OM11051 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Smart, simple solutions for the 12 most common design concerns |
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