ATMEGA168PA-CCU Atmel, ATMEGA168PA-CCU Datasheet - Page 71
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ATMEGA168PA-CCU
Manufacturer Part Number
ATMEGA168PA-CCU
Description
IC MCU AVR 16K FLASH VFBGA
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA168PA-CCU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-UFBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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12. External Interrupts
12.1
8271C–AVR–08/10
Pin Change Interrupt Timing
The External Interrupts are triggered by the INT0 and INT1 pins or any of the PCINT23...0 pins.
Observe that, if enabled, the interrupts will trigger even if the INT0 and INT1 or PCINT23...0 pins
are configured as outputs. This feature provides a way of generating a software interrupt. The
pin change interrupt PCI2 will trigger if any enabled PCINT[23:16] pin toggles. The pin change
interrupt PCI1 will trigger if any enabled PCINT[14:8] pin toggles. The pin change interrupt PCI0
will trigger if any enabled PCINT[7:0] pin toggles. The PCMSK2, PCMSK1 and PCMSK0 Regis-
ters control which pins contribute to the pin change interrupts. Pin change interrupts on
PCINT23...0 are detected asynchronously. This implies that these interrupts can be used for
waking the part also from sleep modes other than Idle mode.
The INT0 and INT1 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 External Interrupt Control Register A – EICRA.
When the INT0 or INT1 interrupts are enabled and are configured as level triggered, the inter-
rupts will trigger as long as the pin is held low. Note that recognition of falling or rising edge
interrupts on INT0 or INT1 requires the presence of an I/O clock, described in
and their Distribution” on page
nously. 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:
An example of timing of a pin change interrupt is shown in
Figure 12-1. Timing of pin change interrupts
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
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 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
pcint_setflag
pcint_in_(0)
PCINT(0)
pcint_syn
pin_sync
pin_lat
PCINT(0)
PCIF
clk
clk
LE
pin_lat
26. Low level interrupt on INT0 and INT1 is detected asynchro-
D
Q
pin_sync
PCINT(0) in PCMSK(x)
pcint_in_(0)
26.
0
x
clk
Figure
pcint_syn
12-1.
pcint_setflag
PCIF
”Clock Systems
71
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