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ATMEGA32-16AC Folha de dados(PDF) 39 Page - ATMEL Corporation

Nome de Peças ATMEGA32-16AC
Descrição Electrónicos  8-bit AVR Microcontroller with 32K Bytes In-System Programmable Flash
Download  347 Pages
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA32-16AC Folha de dados(HTML) 39 Page - ATMEL Corporation

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ATmega32(L)
2503J–AVR–10/06
External Reset
An External Reset is generated by a low level on the RESET pin. Reset pulses longer
than the minimum pulse width (see Table 15) 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 – V
RST – on its positive edge, the delay
counter starts the MCU after the Time-out period t
TOUT has expired.
Figure 18. External Reset During Operation
Brown-out Detection
ATmega32 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
CC
level during operation by comparing it to a fixed trigger level. The trigger level for the
BOD can be selected by the fuse BODLEVEL to be 2.7V (BODLEVEL unprogrammed),
or 4.0V (BODLEVEL programmed). The trigger level has a hysteresis to ensure spike
free Brown-out Detection. The hysteresis on the detection level should be interpreted as
V
BOT+ = VBOT + VHYST/2 and VBOT- = VBOT - VHYST/2.
The BOD circuit can be enabled/disabled by the fuse BODEN. When the BOD is
enabled (BODEN programmed), and V
CC decreases to a value below the trigger level
(V
BOT- in Figure 19), the Brown-out Reset is immediately activated. When VCC increases
above the trigger level (V
BOT+ in Figure 19), the delay counter starts the MCU after the
Time-out period t
TOUT has expired.
The BOD circuit will only detect a drop in V
CC if the voltage stays below the trigger level
for longer than t
BOD given in Table 15.
Figure 19. Brown-out Reset During Operation
CC
VCC
RESET
TIME-OUT
INTERNAL
RESET
VBOT-
VBOT+
tTOUT


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