ATtiny261-ESSZ datasheet(54/227 Pages) ATMEL

54 / 227 page

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

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

when INT1 is configured as a level interrupt.

• Bit 6 – 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 GIMSK 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.

• Bit 5 – PCIF: Pin Change Interrupt Flag

When a logic change on any PCINT15 pin triggers an interrupt request, PCIF becomes set

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

• Bits 4:0 – Res: Reserved Bits

These bits are reserved bits in the ATtiny261/461/861 and will always read as zero.

11.1.4

PCMSK0 – Pin Change Mask Register A

• Bits 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 PCIE1 bit in GIMSK is set, pin change interrupt is enabled on the cor-

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

disabled.

11.1.5

PCMSK1 – Pin Change Mask Register B

• Bits 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 PCINT11:8 is set and the PCIE0 bit in GIMSK is set, pin change interrupt is enabled on

the corresponding I/O pin, and if PCINT15:12 is set and the PCIE1 bit in GIMSK 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

76543

210

0x23 (0x43)

PCINT7

PCINT6

PCINT5

PCINT4

PCINT3

PCINT2

PCINT1

PCINT0

PCMSK0

Read/Write

R/WR/W

R/WR/w

R/WR/W

Initial Value

11001

000

Bit

6543

210

0x22 (0x42)

PCINT15

PCINT14

PCINT13

PCINT12

PCINT11

PCINT10

PCINT9

PCINT8

PCMSK1

Read/Write

R/W

R/w

R/W

Initial Value

1111

111

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