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南昌工程学院
2007 级毕业(设计)论文
信息工程学院系(院) 电子信息工程专业
中英文献翻译
题目基于超声波检测的倒车雷达设计(硬件设计)
学生姓名
班级 2007电子信息工程
学号 2007100153
指导教师
日期 2011 年 03 月 21 日

南昌工程学院教务处订制
AT89C2051 Microcontroller Instructions
Features
Compatible with MCS-51 Products
2 Kbytes of Reprogrammable Flash Memory
Endurance: 1,000 Write/Erase Cycles
V to 6 V Operating Range
Fully Static Operation: 0 Hz to 24 MHz
Two-Level Program Memory Lock
128 x 8-Bit Internal RAM
15 Programmable I/O Lines
Two 16-Bit Timer/Counters
Six Interrupt Sources
Programmable Serial UART Channel
Direct LED Drive Outputs
On-Chip parator
Low Power Idle and Power Down Modes
Description
The AT89C2051 is a low-voltage, high-performance CMOS 8-bit puter with 2 Kbytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s high density nonvolatile memory technology and patible with the industry standard MCS-51 instruction set and pinout. bining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C2051 is a powerful puter which provides a highly flexible and cost effective solution to many embedded control applications.
The AT89C2051 provides the following standard features: 2 Kbytes of Flash, 128 bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt architecture, a full duplex serial port, a precision parator, on-chip oscillator and clock circuitry. In addition, the AT89C2051 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The Power Down Mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset.
Pin Configuration

Pin Description
VCC Supply voltage.
GND Ground.
Port 1
Port 1 is an 8-bit bidirectional I/O port. Port pins P