基于单片机的十六路抢答器的设计的开题报告

基于单片机的十六路抢答器的设计的开题报告内容摘要：

dings, industry。 microputers embedded control system as the main and core, instead of the traditional control System of conventional electronic circuits. At the same time the development of intelligent buildings and maturity, but also based on the lighting control system MCU and popularity of application laid a solid foundation. 8 Points for electronic smart Answer devices in the process, in order to know which group or which one player to answer, we must design a system to plete this task. If the Answer in the process, rely on the visual is very difficult to determine which group to answer SCM system used to design Answer devices, bringing the above problems are resolved, even if the two groups Answer devices the difference in time a few microseconds, which can also be distinguished group of priority answer. Answer devices group of eight can within the arbitrary use of the system designed to be modular form of a eightpin plugs to connect the system working principle of the system used MCS51 as a core. Control systems of the five modules are: MCU minimum system (six parallel digital display, 4 x 4 matrix keyboard), modules, and display driver module, Answer devices switch modules, music, audio output module. Description The AT89C51 is a lowpower, highperformance CMOS 8bit microputer with 4Kbytes of Flash Programmable and Erasable Read Only Memory (PEROM). The device is manufactured using Atmel’s high density nonvolatile memory technology and is patible with the industry standard MCS51™ instruction set and pin out. 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 highly flexible and cost effective solution to many embedded control applications. Features： • Compatible with MCS51 Products • 4K Bytes of InSystem Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles • Fully Static Operation: 0 Hz to 24 MHz • ThreeLevel Program Memory Lock • 128 x 8Bit Internal RAM • 32 Programmable I/O Lines • Two 16Bit Timer/Counters • Six Interrupt Sources • Programmable Serial Channel • Low Power Idle and Power Down Modes Pin Configurations： The AT89C51 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, two 16bit timer/counters, a five vector twolevel interrupt architecture, a full duplex serial port, onchip 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. 9 GND： Ground Port 0： Port 0 is an 8bit open drain 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 high impedance inputs. Port 0 may also be configured to be the multiplexed low order address/data bus during accesses to external program and data memory. In this mode P0 has internal pullups. Port 0 also receives the code bytes during Flash programming, and outputs the code bytes during program verification. External pullups are required during program verification. Port 1: Port 1 is an 8bit bidirectional I/O port with internal pullups. 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 pullups 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 pullups. Port 1 also receives the loworder address bytes during Flash programming and verification. Port 2: Port 2 is an 8bit bidirectional I/O port with internal pullups. The Port 2 output buffers can sink/source four TTL inputs. When 1s are written to Po。