ATtiny13A datasheet(48/174 Pages) ATMEL

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8126D–AVR–11/09

ATtiny13A

9.3.3

GIFR – General Interrupt Flag Register

• Bits 7, 4:0 – Res: Reserved Bits

These bits are reserved bits in the ATtiny13A and will always read as zero.

• 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 PCINT5:0 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.

9.3.4

PCMSK – Pin Change Mask Register

• Bits 7, 6 – Res: Reserved Bits

These bits are reserved bits in the ATtiny13A and will always read as zero.

• Bits 5:0 – PCINT5:0: Pin Change Enable Mask 5:0

Each PCINT5:0 bit selects whether pin change interrupt is enabled on the corresponding I/O pin.

If PCINT5:0 is set and the PCIE bit in GIMSK is set, pin change interrupt is enabled on the cor-

responding I/O pin. If PCINT5:0 is cleared, pin change interrupt on the corresponding I/O pin is

disabled.

Bit

76543210

0x3A

–

INTF0

PCIF

–––––

GIFR

Read/Write

R/W

RRRRR

Initial Value

00000000

Bit

76543210

0x15

–

PCINT5

PCINT4

PCINT3

PCINT2

PCINT1

PCINT0

PCMSK

Read/Write

R/W

Initial Value

00000000

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