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8025I–AVR–02/09

ATmega48P/88P/168P/328P

• Bit 0 - PCIF0: Pin Change Interrupt Flag 0

When a logic change on any PCINT7..0 pin triggers an interrupt request, PCIF0 becomes set

(one). If the I-bit in SREG and the PCIE0 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.

10.2.6 PCMSK2 – Pin Change Mask Register 2

• Bit 7..0 – PCINT23..16: Pin Change Enable Mask 23..16

Each PCINT23..16-bit selects whether pin change interrupt is enabled on the corresponding I/O

pin. If PCINT23..16 is set and the PCIE2 bit in PCICR is set, pin change interrupt is enabled on

the corresponding I/O pin. If PCINT23..16 is cleared, pin change interrupt on the corresponding

I/O pin is disabled.

10.2.7 PCMSK1 – Pin Change Mask Register 1

• Bit 7 – Res: Reserved Bit

This bit is an unused bit in the ATmega48P/88P/168P/328P, and will always read as zero.

• Bit 6..0 – PCINT14..8: Pin Change Enable Mask 14..8

Each PCINT14..8-bit selects whether pin change interrupt is enabled on the corresponding I/O

pin. If PCINT14..8 is set and the PCIE1 bit in PCICR is set, pin change interrupt is enabled on

the corresponding I/O pin. If PCINT14..8 is cleared, pin change interrupt on the corresponding

I/O pin is disabled.

10.2.8 PCMSK0 – Pin Change Mask Register 0

• Bit 7..0 – PCINT7..0: Pin Change Enable Mask 7..0

Each PCINT7..0 bit selects whether pin change interrupt is enabled on the corresponding I/O

pin. If PCINT7..0 is set and the PCIE0 bit in PCICR is set, pin change interrupt is enabled on the

corresponding I/O pin. If PCINT7..0 is cleared, pin change interrupt on the corresponding I/O pin

is disabled.

Bit 76543210

(0x6D)

PCINT23 PCINT22 PCINT21 PCINT20 PCINT19 PCINT18 PCINT17 PCINT16 PCMSK2

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

Bit 76543210

(0x6C)

– PCINT14 PCINT13 PCINT12 PCINT11 PCINT10 PCINT9 PCINT8 PCMSK1

Read/Write R R/W R/W R/W R/W R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

Bit 76543210

(0x6B) PCINT7 PCINT6 PCINT5 PCINT4 PCINT3 PCINT2 PCINT1 PCINT0 PCMSK0

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

Atmel ATmega48PV User Manual

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