毕业设计论文外文翻译单片机.doc

毕业设计(论文)外文翻译单片机

专业文献翻译题目: AT89C51的介绍姓名: 学院: 专业: 电子信息科学与技术班级: 班学号: 指导教师: 职称: 20 年月日南京农业大学教务处制原文:
The Introduction of AT89C51
Description
The AT89C51 is a low-power, high-performance CMOS 8-bit puter with 4K bytes 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. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. bining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C51 is a powerful puter which provides a highly-flexible and cost-effective solution to many embedded control applications.
Function characteristic
The AT89C51 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, two 16-bit timer/counters, one 5 vector two-level interrupt architecture, a full duplex serial port, one-chip oscillator and clock circuitry. In addition, the AT89C51 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 Description
VCC:Supply voltage.
GND:Ground.
Port 0
Port 0 is an 8-bit open-drain bi-directional I/O port. As an output port, each pin can sink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as high-impedance inputs. Port 0 may also be configured to be the multiplexed address/data bus during accesses to external program and data memory. In this mode P0 has internal Pull-up resistor. Port 0 also receives the code bytes during Flash programming, and outputs the code bytes during Program verification. External Pull-up resistor