ATMEGA6450-16AI(2004) 데이터 시트보기 (PDF) - Atmel Corporation
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ATMEGA6450-16AI Datasheet PDF : 347 Pages
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External Reset
Figure 16. MCU Start-up, RESET Tied to VCC
VCC
VPOT
RESET
VRST
TIME-OUT
tTOUT
INTERNAL
RESET
Figure 17. MCU Start-up, RESET Extended Externally
VCC
VPOT
RESET
VRST
TIME-OUT
tTOUT
INTERNAL
RESET
An External Reset is generated by a low level on the RESET pin. Reset pulses longer
than the minimum pulse width (see Table 16) will generate a reset, even if the clock is
not running. Shorter pulses are not guaranteed to generate a reset. When the applied
signal reaches the Reset Threshold Voltage – VRST – on its positive edge, the delay
counter starts the MCU after the Time-out period – tTOUT – has expired.
Figure 18. External Reset During Operation
CC
Brown-out Detection
ATmega325/3250/645/6450 has an On-chip Brown-out Detection (BOD) circuit for mon-
itoring the VCC level during operation by comparing it to a fixed trigger level. The trigger
level for the BOD can be selected by the BODLEVEL Fuses. The trigger level has a hys-
40 ATmega325/3250/645/6450
2570A–AVR–09/04
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