ATmega169P datasheet(63/393 Pages) ATMEL

63 / 393 page

8018N–AVR–08/09

ATmega169P

interrupt request even if INT0 is configured as an output. The corresponding interrupt of External

Interrupt Request 0 is executed from the INT0 Interrupt Vector.

12.2.3

EIFR – External Interrupt Flag Register

• Bit 7 – PCIF1: Pin Change Interrupt Flag 1

When a logic change on any PCINT15..8 pin triggers an interrupt request, PCIF1 becomes set

(one). If the I-bit in SREG and the PCIE1 bit in EIMSK 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 6 – 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 EIMSK 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 0 – INTF0: External Interrupt Flag 0

When an edge or logic change on the INT0 pin triggers an interrupt request, INTF0 becomes set

(one). If the I-bit in SREG and the INT0 bit in EIMSK are set (one), the MCU will jump to the cor-

responding Interrupt Vector. The flag is cleared when the interrupt routine is executed.

Alternatively, the flag can be cleared by writing a logical one to it. This flag is always cleared

when INT0 is configured as a level interrupt.

12.2.4

PCMSK1 – Pin Change Mask Register 1

• Bit 7:0 – PCINT15:8: Pin Change Enable Mask 15..8

Each PCINT15:8-bit selects whether pin change interrupt is enabled on the corresponding I/O

pin. If PCINT15:8 is set and the PCIE1 bit in EIMSK is set, pin change interrupt is enabled on the

corresponding I/O pin. If PCINT15..8 is cleared, pin change interrupt on the corresponding I/O

pin is disabled.

Bit

543

210

0x1C (0x3C)

PCIF1

PCIF0

–

INTF0

EIFR

Read/Write

R/W

Initial Value

Bit

5432

(0x6C)

PCINT15

PCINT14

PCINT13

PCINT12

PCINT11

PCINT10

PCINT9

PCINT8

PCMSK1

Read/Write

R/W

Initial Value

0000

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