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廈門(mén)泰尼電氣有限公司
主營(yíng)產(chǎn)品： AB模塊PLC |
會(huì)員1.png)
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廈門(mén)泰尼電氣有限公司
主營(yíng)產(chǎn)品： AB模塊PLC |
| 參考價(jià) | 面議 |
聯(lián)系方式：張亮查看聯(lián)系方式
更新時(shí)間：2018-05-15 08:33:06瀏覽次數(shù)：265
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269PLUS-10C-120*-*269PLUS-10C-120
269PLUS-10C-120*-*269PLUS-10C-120
單片機(jī)復(fù)位電路原理是在單片機(jī)的復(fù)位引腳RST上外接電阻和電容，實(shí)現(xiàn)上電復(fù)位。當(dāng)復(fù)位電平持續(xù)兩個(gè)機(jī)器周期以上時(shí)復(fù)位有效。復(fù)位電平的持續(xù)時(shí)間必須大于單片機(jī)的兩個(gè)機(jī)器周期，具體數(shù)值可以由RC電路計(jì)算出時(shí)間常數(shù)。
如下圖所示，單片機(jī)復(fù)位電路是由按鍵復(fù)位和上電復(fù)位兩部分組成。其中，STC89系列單片及為高電平復(fù)位，通常在復(fù)位引腳RST上連接一個(gè)電容到VCC,再連接一個(gè)電阻到GND,由此形成一個(gè)RC充放電回路保證單片機(jī)在上電時(shí)RST腳上有足夠時(shí)間的高電平進(jìn)行復(fù)位，隨后回歸到低電平進(jìn)入正常工作狀態(tài)，這個(gè)電阻和電容的典型值為10K和10uF.而按鍵復(fù)位就是在復(fù)位電容上并聯(lián)一個(gè)開(kāi)關(guān)，當(dāng)開(kāi)關(guān)按下時(shí)電容被放電、RST也被拉到高電平，而且由于電容的充電，會(huì)保持一段時(shí)間的高電平來(lái)使單片機(jī)復(fù)位。
：張亮（工程師） 專(zhuān)線：
24小時(shí)移動(dòng)專(zhuān)線： 【】
Cymer ADC Interface Board 05-05184-00 Rev. 001 Working
Schlumberger TLA DC Motor Driver Assembly 504-000 Worki
Matrix Transport Interface Board 1010-0019 Rev. A Worki
Matrix Transport Interface Board 1010-0019 Rev. B Worki
BTU Engineering System I/O Board 3161161 Rev. 7/14 Work
BTU Engineering Video Interface Board 3161524 EPROM V2.
BTU Engineering Video Interface Board 3161524 EPROM V1.
BTU Engineering Video Interface Board 3161524 EPROM V2.
BTU Engineering Video Interface Board 3161181 EPROM V2.
BTU Engineering Video Interface Board 3181180 EPROM V2.
PCB Interconnect Board 3281-000090-13 Working 3208-
PCB Pincette Base Board 3281-000085-11 Working 3208
PCB Bridge Interconnect 2 Board 3281-000089-11
Nanomotion DC-12 PCB Card 002ES001 Working
KLA-Tencor Z-Stage 25 Pin Board 395617 AIT2
KLA-Tencor Tower Light Driver Board 552364 Rev. AB
Varian NW-40-H/O Angle Valve L9480-503 CF40 Flange Work
Ebara EMO Box Lot (4)
Applied Materials Digital I/O Board 0100-76124 AMA
SMC 11GPM RAD 300 Flow Switch Assembly PF2W511-N10-1 Ne
National Instruments NI ER-16 Electromechanic?al Relay 1
Kensington Labs 5 Axis Motherboard 77-4000-0043-01 Rev.
Tenta Technology PET Distribution Board AS00037-01 Rev.
Oriental Vexta 5-Phase Servo Drive UDK5114NW2 working
MKS Dual-Zone Pressure Controller DPCA-26028 Type DPC
Schaffner Power Filter FN356-25-24 working pair
Tokyo Electron Clean Track Unit Controller UC-510 w
AMAT Applied Materials PVD 6" Process Kit 0020-28064
Small World 200mm Wafer X-Checker Working
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View Engineering 2860240-511 DCO/MCU Board working
nbsp;RS-485 Mass Flo Meter 179A-21861 10000 SCCM N2 Refu
