P89LPC921 概述

P89LPC921是一款单片封装的微控制器，适用于要求高度集成、低成本的应用场合，可以满足多种多样的性能要求。P89LPC921基于高性能的处理架构，执行指令仅需2到4个时钟周期，速度是标准80C51器件的6倍。P89LPC921集成了多种系统级功能，以便极大减少元件数目和减小电路板面积，从而降低系统成本。

P89LPC921 特性

• 4 kB Flash code memory with 1 kB erasable sectors, 64-byte erasable page size, and single byte erase.
• 256-byte RAM data memory.
• Two 16-bit counter/timers. Each timer may be configured to toggle a port output upon timer overflow or to become a PWM output.
• Real-Time clock that can also be used as a system timer.
• Two analog comparators with selectable inputs and reference source.
• Enhanced UART with fractional baud rate generator, break detect, framing error detection, automatic address detection and versatile interrupt capabilities.
• 400 kHz byte-wide I²C-bus communication port.
• Configurable on-chip oscillator with frequency range and RC oscillator options (selected by user programmed Flash configuration bits). The RC oscillator (factory calibrated to +-1 pct) option allows operation without external oscillator components. Oscillator options support frequencies from 20 kHz to the maximum operating frequency of 18 MHz. The RC oscillator option is selectable and fine tunable.
• 2.4 V to 3.6 V V_DD operating range. I/O pins are 5 V tolerant (may be pulled up or driven to 5.5 V).