ATmega48PA datasheet(73/448 Pages) ATMEL

73 / 448 page

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

12.2.4

PCICR – Pin Change Interrupt Control Register

• Bit 7..3 - Res: Reserved Bits

These bits are unused bits in the ATmega48PA/88PA/168PA/328P, and will always read as

zero.

• Bit 2 - PCIE2: Pin Change Interrupt Enable 2

When the PCIE2 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), pin

change interrupt 2 is enabled. Any change on any enabled PCINT23..16 pin will cause an inter-

rupt. The corresponding interrupt of Pin Change Interrupt Request is executed from the PCI2

Interrupt Vector. PCINT23..16 pins are enabled individually by the PCMSK2 Register.

• Bit 1 - PCIE1: Pin Change Interrupt Enable 1

When the PCIE1 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), pin

change interrupt 1 is enabled. Any change on any enabled PCINT14..8 pin will cause an inter-

rupt. The corresponding interrupt of Pin Change Interrupt Request is executed from the PCI1

Interrupt Vector. PCINT14..8 pins are enabled individually by the PCMSK1 Register.

• Bit 0 - PCIE0: Pin Change Interrupt Enable 0

When the PCIE0 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), pin

change interrupt 0 is enabled. Any change on any enabled PCINT7..0 pin will cause an interrupt.

The corresponding interrupt of Pin Change Interrupt Request is executed from the PCI0 Inter-

rupt Vector. PCINT7..0 pins are enabled individually by the PCMSK0 Register.

12.2.5

PCIFR – Pin Change Interrupt Flag Register

• Bit 7..3 - Res: Reserved Bits

These bits are unused bits in the ATmega48PA/88PA/168PA/328P, and will always read as

zero.

• Bit 2 - PCIF2: Pin Change Interrupt Flag 2

When a logic change on any PCINT23..16 pin triggers an interrupt request, PCIF2 becomes set

(one). If the I-bit in SREG and the PCIE2 bit in PCICR are set (one), the MCU will jump to the

corresponding Interrupt Vector. The flag is cleared when the interrupt routine is executed. Alter-

natively, the flag can be cleared by writing a logical one to it.

• Bit 1 - PCIF1: Pin Change Interrupt Flag 1

When a logic change on any PCINT14..8 pin triggers an interrupt request, PCIF1 becomes set

(one). If the I-bit in SREG and the PCIE1 bit in PCICR are set (one), the MCU will jump to the

corresponding Interrupt Vector. The flag is cleared when the interrupt routine is executed. Alter-

natively, the flag can be cleared by writing a logical one to it.

Bit

76543

210

(0x68)

–––––

PCIE2

PCIE1

PCIE0

PCICR

Read/Write

R/W

Initial Value

00000

000

Bit

76543

210

0x1B (0x3B)

–––––

PCIF2

PCIF1

PCIF0

PCIFR

Read/Write

R/W

Initial Value

00000

000

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