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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89C5122D-RDRUM датащи(PDF) 170 Page - ATMEL Corporation |
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AT89C5122D-RDRUM датащи(HTML) 170 Page - ATMEL Corporation |
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170 / 208 page  170 AT83R5122, AT8xC5122/23 4202F–SCR–07/2008 Microcontroller Reset Introduction The internal reset is used to start up (cold reset) or to re-start (warm reset) the micro- controller activity. When the reset is applied (active state), all internal registers are initialized so that the microcontroller starts from a known and clean state for the program always runs as expected. The reset is released (inactive state) when the following conditions are internally met : – The power supply has reatched a minimum level which garantees that the microcontroller works properly – The on-chip oscillator has reached a minimum oscillation level which ensures a good noise to signal ratio and a correct internal duty cycle – the active state duration is at least two machine cycles. If one of the above conditions is not met the microcontroller is not correctly reset and might not work properly. The internal reset comes from four different sources : – Reset pin –Power On Reset (POR) – Power Fail Detector (PFD) – Hardware Watch-Dog Timer (WDT) Figure 100. Reset bock diagram Watch Dog RST Internal Reset Timer Microcontroller Vcc 3.3V Internal Digital Regulator C51 Core VCore POR PFD |
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