电子密码锁的设计外文翻译(共16页).doc

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外文文献译文
设de 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.
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The 8051 microcontroller is an industry standard architecture that has broad acceptance, wide-ranging applications and development tools available. There are numerous commercial vendors that supply this controller or have it integrated into some type of system-on-a-chip structure. Both MRC and IAμE chose this device to demonstrate two distinctly different technologies for hardening. The MRC example of this is to use temporal latches that require specific timing to ensure that single event effects are minimized. The IAμE technology uses ultra low power, and layout and architecture HBD design rules to achieve their results. These are fundamentally different than the approach by Aeroflex-United Technologies Microelectronics Center (UTMC), the commercial vendor of a radiation– hardened 8051, that built their 8051 microcontroller using radiation hardened processes. This broad range of technology within one device structure makes the 8051an ideal vehicle for performing this technology evaluation
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 low order address/bus during accesses to external program and data memory. In this mode P0 has internal pull ups.
Port 0 also receives the code bytes during Flash programming, and outputs the code bytes during p