ATmega32A datasheet(71/352 Pages) ATMEL

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8155B–AVR–07/09

ATmega32A

the ISC2 bit can be changed. Finally, the INT2 Interrupt Flag should be cleared by writing a logi-

cal one to its Interrupt Flag bit (INTF2) in the GIFR Register before the interrupt is re-enabled.

13.1.3

GICR – General Interrupt Control Register

• Bit 7 – INT1: External Interrupt Request 1 Enable

When the INT1 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), the exter-

nal pin interrupt is enabled. The Interrupt Sense Control1 bits 1/0 (ISC11 and ISC10) in the MCU

General Control Register (MCUCR) define whether the External Interrupt is activated on rising

and/or falling edge of the INT1 pin or level sensed. Activity on the pin will cause an interrupt

request even if INT1 is configured as an output. The corresponding interrupt of External Interrupt

Request 1 is executed from the INT1 interrupt Vector.

• Bit 6 – INT0: External Interrupt Request 0 Enable

When the INT0 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), the exter-

nal pin interrupt is enabled. The Interrupt Sense Control0 bits 1/0 (ISC01 and ISC00) in the MCU

General Control Register (MCUCR) define whether the External Interrupt is activated on rising

and/or falling edge of the INT0 pin or level sensed. Activity on the pin will cause an 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.

• Bit 5 – INT2: External Interrupt Request 2 Enable

When the INT2 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), the exter-

nal pin interrupt is enabled. The Interrupt Sense Control2 bit (ISC2) in the MCU Control and

Status Register (MCUCSR) defines whether the External Interrupt is activated on rising or falling

edge of the INT2 pin. Activity on the pin will cause an interrupt request even if INT2 is configured

as an output. The corresponding interrupt of External Interrupt Request 2 is executed from the

INT2 Interrupt Vector.

13.1.4

GIFR – General Interrupt Flag Register

• Bit 7 – INTF1: External Interrupt Flag 1

When an edge or logic change on the INT1 pin triggers an interrupt request, INTF1 becomes set

(one). If the I-bit in SREG and the INT1 bit in GICR are set (one), the MCU will jump to the corre-

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

Table 13-3.

Asynchronous External Interrupt Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

tINT

Minimum pulse width for asynchronous

external interrupt

Bit

543

INT1

INT0

INT2

–

IVSEL

IVCE

GICR

Read/Write

R/W

Initial Value

Bit

543

INTF1

INTF0

INTF2

–

–GIFR

Read/Write

R/W

RRR

Initial Value

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