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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATMEGA640 датащи(PDF) 58 Page - Microchip Technology |
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ATMEGA640 датащи(HTML) 58 Page - Microchip Technology |
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58 / 436 page  58 ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET] DS40002211A Figure 12-1. Reset Logic 12.2.1 Power-on Reset A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level is defined in “Sys- tem and Reset Characteristics” on page 360. The POR is activated whenever VCC is below the detection level. The POR circuit can be used to trigger the start-up Reset, as well as to detect a failure in supply voltage. A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the Power-on Reset threshold voltage invokes the delay counter, which determines how long the device is kept in RESET after VCC rise. The RESET signal is activated again, without any delay, when VCC decreases below the detection level. Figure 12-2. MCU Start-up, RESET Tied to VCC MCU Status Register (MCUSR) Delay Counters CKSEL[3:0] CK TIMEOUT DATA BUS Clock Generator SPIKE FILTER Pull-up Resistor JTAG Reset Register Watchdog Oscillator SUT[1:0] Brown-out Reset Circuit BODLEVEL [2..0] Power-on Reset Circuit AVCC V RESET TIME-OUT INTERNAL RESET t TOUT V POT V RST CC |
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