ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 49

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

11.4
9223B–AVR–09/11
External Reset
Figure 11-2. MCU Start-up, RESET Tied to V
Figure 11-3. MCU Start-up, RESET Extended Externally
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
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
the delay counter starts the MCU after the Time-out period – t
Reset can be disabled by the RSTDISBL fuse, see
Figure 11-4. External Reset During Operation
INTERNAL
Atmel ATmega48PA/88PA/168PA [Preliminary]
TIME-OUT
INTERNAL
V
TIME-OUT
CC
RESET
RESET
RESET
RESET
V
CC
CC
V
CCRR
V
V
V
RST
PORMAX
PORMIN
V
“System and Reset Characteristics” on page
POT
t
TOUT
V
CC
RST
t
TOUT
Table 28-7 on page
TOUT
– has expired. The External
RST
– on its positive edge,
297.
318) will generate a
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