Datasheet

40
ATtiny828 [DATASHEET]
8371A–AVR–08/12
Figure 14. MCU Start-up, RESET Tied to V
CC
Figure 15. MCU Start-up, RESET Extended Externally
8.2.2 External Reset
An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses longer than the minimum pulse
width (see section “System and Reset Characteristics” on page 250) 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.
V
T
IME-OUT
RESET
RESET
TOUT
INTERNAL
t
V
POT
V
RST
CC
V
TIME-OUT
TOUT
TOUT
INTERNAL
CC
t
V
POT
V
RST
> t
RESET
RESET