ATA5771_09 ATMEL [ATMEL Corporation], ATA5771_09 Datasheet - Page 105

• Manufacturer Part Number: ATA5771_09
• Description: Microcontroller with UHF ASK/FSK Transmitter
• Manufacturer: ATMEL [ATMEL Corporation]

11. External Interrupts
11.1
52
Pin Change Interrupt Timing
ATtiny24/44/84
The External Interrupts are triggered by the INT0 pin or any of the PCINT11..0 pins. Observe
that, if enabled, the interrupts will trigger even if the INT0 or PCINT11..0 pins are configured as
outputs. This feature provides a way of generating a software interrupt. Pin change 0 interrupts
PCI0 will trigger if any enabled PCINT7..0 pin toggles. Pin change 1 interrupts PCI1 will trigger if
any enabled PCINT11..8 pin toggles. The PCMSK0 and PCMSK1 Registers control which pins
contribute to the pin change interrupts. Pin change interrupts on PCINT11..0 are detected asyn-
chronously. This implies that these interrupts can be used for waking the part also from sleep
modes other than Idle mode.
The INT0 interrupts can be triggered by a falling or rising edge or a low level. This is set up as
indicated in the specification for the MCU Control Register – MCUCR. When the INT0 interrupt is
enabled and is configured as level triggered, the interrupt will trigger as long as the pin is held
low. Note that recognition of falling or rising edge interrupts on INT0 requires the presence of an
I/O clock, described in
INT0 is detected asynchronously. This implies that this interrupt can be used for waking the part
also from sleep modes other than Idle mode. The I/O clock is halted in all sleep modes except
Idle mode.
Note that if a level triggered interrupt is used for wake-up from Power-down, the required level
must be held long enough for the MCU to complete the wake-up to trigger the level interrupt. If
the level disappears before the end of the Start-up Time, the MCU will still wake up, but no inter-
rupt will be generated. The start-up time is defined by the SUT and CKSEL Fuses as described
in
An example of timing of a pin change interrupt is shown in
Timing of pin change interrupts
”System Clock and Clock Options” on page
pcint_setflag
pcint_in_(0)
PCINT(0)
pcint_syn
pin_sync
pin_lat
PCINT(0)
PCIF
clk
clk
”Clock Systems and their Distribution” on page
LE
pin_lat
D
Q
pin_sync
PCINT(0) in PCMSK(x)
25.
pcint_in_(0)
0
x
clk
Figure
pcint_syn
.
pcint_setflag
25. Low level interrupt on
PCIF
7701C–AVR–12/08