NXP LPC1311 Cortex-M3 CPU USB接口方案

NXP LPC1311/13/42/43 是基于Cortex-M3 的微控制器，具有高度集成和低功耗，可用于嵌入式应用。CPU工作频率高达72MHz，单电源2.0V-3.6V工作，内置了嵌套中断向量控制器(NVIC)，多达32KB闪存，多达8KB数据存储器，USB设备，快速模式I2C总线接口，一个UART，四个通用定时器和多达42个GPIO引脚。主要应用在电子测量，照明，告警系统和白色家电。本文介绍了LPC1311/13/42/43主要特性，方框图，时钟发生方框图以及自供电USB接口框图和总线供电USB接口框图。

The LPC1311/13/42/43 are ARM Cortex-M3 based microcontrollers for embedded applications featuring a high level of integration and low power consumption. The ARM Cortex-M3 is a next generation core that offers system enhancements such as enhanced debug features and a higher level of support block integration.

The LPC1311/13/42/43 operate at CPU frequencies of up to 72 MHz. The ARM Cortex-M3 CPU incorporates a 3-stage pipeline and uses a Harvard architecture with separate local instruction and data buses as well as a third bus for peripherals. The ARM Cortex-M3 CPU also includes an internal prefetch unit that supports speculative branching.

The peripheral complement of the LPC1311/13/42/43 includes up to 32 kB of flash memory, up to 8 kB of data memory, USB Device (LPC1342/43 only), one Fast-mode Plus I2C-bus interface, one UART, four general purpose timers, and up to 42 general purpose I/O pins.
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