基于單片機(jī)溫度監(jiān)測(cè)系統(tǒng)設(shè)計(jì)的外文翻譯(編輯修改稿)
2024-12-29 01:33 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 ry, ATMEL AT89C51 is a kind of high efficient micro controller, AT89C2051 is a streamlined version. AT89C 51microcontroller as many embedded control system .Arrange appearance and pin as shown in figure 12 shown DS1820 DS1820 DS1820 DS1820 AT89C51 MCU Display element Button control unit 第 4 頁(yè) 12 AT89C51 pins figure Major features: and MCS 51 patible 4K bytes programmable FLASH memory life: 1000 write/wipe cycle data retention time: 10 years the static job: 0Hz 24MHz level 3 program memory lock 128 x 8 bits internal RAM 32 programmable I/O lines two 16 timer 5 interrupt source programmable serial channels low power consumption of idle and power lost mode piece inside oscillator and clock circuit Tube feet explains: VCC: power supply voltage. GND: grounded. P0 Mouth: P0 mouth a eight leak level twoway I/O mouth open, every foot can absorb 8TTL gate current. When the pipe mouth P0 feet first write 1, defined as high resistance input. P0 can be used for 第 5 頁(yè) external program data storage, it can be defined as the eighth data/address. In FIASH programming, P0 mouth as the sourcecode input port, when FIASH check, the sourcecode P0 output, when P0 external must be pulled. P1 mouth: mouth is an internal P1 provide pullup resistors 8bit twoway I/O mouth, P1 mouth buffer can receive 4TTL gate current output. P1 mouth tube feet, was then write 1 for high, pull up inside can be used as input, P1 mouth be external pull down for low electricity at ordinary times, will output current, this is due to internal pull up sake. In FLASH programming and calibration, P1 mouth as eighth address to receive. P2 mouth: for an internal P2 mouth on the 8bit pullup resistors twoway I/O port, P2 mouth to receive, the output buffer 4 TTL gate current, when P2 mouth is written 1, its tube feet are internal pullup resistors, and push as input. And so as the input, P2 mouth feet are external down tube, will output current. This is due to internal pull up sake. P2 mouth when used external program memory or 16 address external data memory access, P2 mouth high output address eight. In a given address 1, it using internal and external 8 address advantage, when for reading and writing data memory, P2 when the special function registers mouth output of content. P2 mouth in FLASH programming and the calibration eight address when receiving high signal and control signals. P3 mouth: P3 mouth pipe is 8 feet with internal pullup resistors twoway I/O port, may receive four TTL gate current out put. When P3 mouth writing 1, they are internal and high level, and used as input. As input, due to external dropdown for low level, P3 mouth will output current (ILL) this is due to pull up39。s sake. RST: reset input. When oscillator reset device to keep RST feet high level two machine cycle time. ALE/PROG: when access external storage, address latch allows the output level o
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