外文翻譯--at89c51單片機(jī)的介紹-其他專業(yè)-文庫吧資料
2025-01-27 09:48本頁面
【正文】 學(xué) 號 : 指 導(dǎo)教師 : 職稱 : 20 年 月 日 1 原文： The Introduction of AT89C51 Description The AT89C51 is a lowpower, highperformance CMOS 8bit microputer with 4K bytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s highdensity nonvolatile memory technology and is patible with the industrystandard MCS51 instruction set. The onchip Flash allows the program memory to be reprogrammed insystem or by a conventional nonvolatile memory programmer. By bining a versatile 8bit CPU with Flash on a monolithic chip, the Atmel AT89C51 is a powerful microputer which provides a highlyflexible and costeffective 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 16bit timer/counters, one 5 vector twolevel interrupt architecture, a full duplex serial port, onechip 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 Powerdown 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. 2 Port 0 Port 0 is an 8bit opendrain bidirectional 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 highimpedance 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 Pullup resistor. Port 0 also receives the code bytes during Flash programming, and outputs the code bytes during Program verification. External Pullup resistors are required during Program verification. Port 1 Port 1 is an 8bit bidirectional I/O port with internal Pullup resistors. The Port 1 output buffers can sink/source four TTL inputs. When 1s are written to Port 1 pins they are pulled high by the internal Pullup resistors and can be used as inputs. As inputs, Port 1 pins that are externally being pulled low will source current (IIL) because of the internal Pullup resistors. Port 1 also receives the lowo
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