Datasheet

50
ATtiny25/45/85 [DATASHEET]
2586Q–AVR–08/2013
the Start-up Time, the MCU will still wake up, but no interrupt will be generated. The start-up time is defined by the
SUT and CKSEL Fuses as described in “System Clock and Clock Options” on page 23.
If the low level on the interrupt pin is removed before the device has woken up then program execution will not be
diverted to the interrupt service routine but continue from the instruction following the SLEEP command.
9.2.2 Pin Change Interrupt Timing
An example of timing of a pin change interrupt is shown in Figure 9-1.
Figure 9-1. Timing of pin change interrupts
clk
PCINT(0)
pin_lat
pin_sync
pcint_in_(0)
pcint_syn
p
cint_setflag
PCIF
PCINT(0)
pin_sync
pcint_syn
pin_lat
D Q
LE
pcint_setflag
PC
IF
clk
clk
PCINT(0) in PCMSK(x)
pcint_in_(0)
0
x