AT43USB326-AC Atmel, AT43USB326-AC Datasheet - Page 24

• Manufacturer Part Number: AT43USB326-AC
• Description: IC USB KEYBOARD CTRLR HUB 48LQFP
• Manufacturer: Atmel
• Series: AVR®r

Specifications of AT43USB326-AC

• Applications: Keyboard Controller
• Core Processor: AVR
• Program Memory Type: Mask ROM (16 kB)
• Controller Series: AT43USB
• Ram Size: 512 x 8
• Interface: USB
• Number Of I /o: 32
• Voltage - Supply: 4.4 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

24
AT43USB326
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.
Read/Write
Initial Value
Initial Value
$3A ($5A)
Read/Write
$3B ($5B)
Bit
Bit
R
7
–
0
R
7
–
0
INT F0
R/W
6
0
INT0
R/W
6
0
R
5
–
0
R
5
–
0
R
4
–
0
R
4
–
0
R
3
–
0
R
3
–
0
R
R
2
–
0
2
–
0
R
1
–
0
R
1
–
0
3313D–USB–04/06
R
0
–
0
R
0
–
0
GIMSK
GIFR