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| ATMEGA169P_0611 Datasheet, PDF (48/390 Pages) ATMEL Corporation – 8-bit Microcontroller with 16K Bytes In-System Programmable Flash | |||
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Figure 9-3. MCU Start-up, RESET Extended Externally
VCC
VPOT
RESET
VRST
TIME-OUT
tTOUT
9.2.2
External Reset
INTERNAL
RESET
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see âSystem and Reset Characteristicsâ on page 329) 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 â VRST â on its positive edge, the
delay counter starts the MCU after the Time-out period â tTOUT â has expired.
Figure 9-4. External Reset During Operation
CC
48 ATmega169P
8018IâAVRâ11/06
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