AT43USB326 datasheet(24/102 Pages) ATMEL

24 / 102 page

AT43USB326

3313D–USB–04/06

General Interrupt Mask Register – GIMSK

• Bit 7 – Res: Reserved Bit

• Bit 6 – INT0: Interrupt Request 0 (Suspend/Resume Interrupt) Enable

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

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

the MCU general Control Register (MCUCR) defines whether the external interrupt is acti-

vated on rising 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 Inter-

rupt Request 0 is executed from program memory address $002. See also “External

Interrupts” on page 26.

• Bits 5..0 – Res: Reserved Bits

These bits are reserved bits in the AT43USB326 and always read as zero.

General Interrupt Flag Register – GIFR

• Bit 7 – Res: Reserved Bit

• Bit 6 – INTF0: Interrupt Flag0 (Suspend/Resume Interrupt Flag)

When an event on the INT0 (that is, a USB event-related interrupt) 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 interrupt vector at address $002. The flag is cleared when the

interrupt routine is executed. Alternatively, the flag can be cleared by writing a logical one to it.

• Bits 5..0 – Res: Reserved Bits

These bits are reserved bits in the AT43USB326 and always read as zero.

Bit

210

$3B ($5B)

–

INT0

–

–––

GIMSK

Read/Write

R/W

Initial Value

Bit

543

$3A ($5A)

–

INT F0

–

GIFR

Read/Write

R/W

Initial Value

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