1、最新版毕业设计英文文献51单片机中英文文献翻译#AT89C51的概况#The General Situation of AT89C51#Chapter 1 The application of AT89C51#Microcontrollers are used in a multitude of commercial applications such as modems, motor-control systems, air conditioner control systems, automotive engine and among others. The domains also re
2、quire that these microcontrollers are be ensured by a robust testing process and a proper tools environment for the validation of these microcontrollers both at the component and at the system level. Intel Plaform Engineering department developed an object-oriented multi-threaded test environment fo
3、r the validation of its AT89C51 automotive microcontrollers. The goals of thisenvironment was not only to provide a robust testing environment for the AT89C51 automotive microcontrollers, but to develop an environment which can be easily extended and reused for the validation of several other future
4、 microcontrollers. The environment was developed in conjunction with Microsoft Foundation Classes (AT89C51). The paper describes the design and mechanism of this test environment, its interactions with various #The 8-bit AT89C51 CHMOS microcontrollers are designed to engine-control systems, airbags,
5、 suspension systems, and antilock braking systems (ABS). The AT89C51 is especially well suited to applications that benefit from its processing speed and enhanced on-chip peripheral functions set, such as automotive power-train control, vehicle dynamic suspension, antilock braking, and stability con
6、trol applications. Because of these critical applications, the market requires a reliable cost-effective controller with a low interrupt latency response, ability to service the integrated peripherals needed in real time applications, and a CPU with above average processing power in a single package
7、. The financial and legal risk of the market, particularly in mission criticalapplications such as an autopilot or anti-lock braking system, mistakes are financiallyprohibitive. Redesign costs can run as flaw. In addition, field replacements of components is extremely expensive, as the devices are t
8、ypically sealed in modules with a total value several times that of the component. To mitigate these problems, it is essential that comprehensive testing of the controllers be carried out at both the component level and system level under worst case environmental and voltage conditions.This complete
9、 and thorough validation necessitates not only a well-defined process but also a proper environment and tools to facilitate and execute the mission successfully.Intel Chandler Platform Engineering group provides post silicon system validation (SV) of various micro-controllers and processors. The sys
10、tem validation process can be broken into three major parts.The type of the device and its application requirements determine which types of testing are performed on the device.#1.2 The AT89C51 provides the following standard features:# #4Kbytes of Flash, 128 bytes of RAM, 32 IO lines, two 16-bittim
11、ercounters, a five vector two-level interrupt architecture,a full duple ser -ial port, on-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 C
12、PU while allowing the RAM, timercounters,serial port and interrupt sys -tem to continue functioning. The Power-down Mode saves the RAM contents but freezes the oscil lator disabling all other chip functions until the next Description#VCC Supply voltage.#GND Ground.#Port 0:#Port 0 is an 8-bit open-dr
13、ain bi-directional IO port. As an output port, each pin cansink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as this mode P0 . External pullups are required during programverification.#Port 1:#Port 1 is an 8-bit bi-directional IO port with internal pullups.The Port 1 ou
14、tput buffers can sinkso -urce four TTL inputs.When 1s are written to Port 1 pins they are pulled 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 low-order address bytes during Flash prog
15、ramming and verification.#Port 2:#Port 2 is an 8-bit bi-directional IO port with internal pullups.The Port 2 outputbuffers can sinksource four TTL inputs.When 1s are written to Port 2 pins they arepulled be used as inputs. As inputs, Port 2 pins that are externally being pulled low will source curre
16、nt (IIL) because of the internal pullups. Port 2 emits the this application, it uses strong internal pull-ups when emitting 1s. During accesses to external data memory that use 8-bit addresses (MOVX RI), Port 2 emits the contents of the P2 Special Function Register.Port 2 also receives the Flash programming and verification.#Port 3:#Port 3 is an 8-bit bi-directional IO port with internal pullups.The Port 3 outputbuffers can sinksou -rce four TTL inputs.When 1s are written to Port 3 p
copyright@ 2008-2022 冰豆网网站版权所有
经营许可证编号:鄂ICP备2022015515号-1