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ATmega128
External Interrupt
Mask Register –
Bit
7
6
5
4
3
2
1
0
EIMSK
Read/ W rite
Initial Value
INT7
R/ W
0
INT6
R/ W
0
INT5
R/ W
0
INT4
R/ W
0
INT3
R/ W
0
INT2
R/ W
0
INT1
R/ W
0
IINT0
R/ W
0
EIMSK
? Bits 7..0 – INT7 – INT0: External Interrupt Request 7 - 0 Enable
W hen an INT7 – INT0 bit is written to one and the I-bit in the Status Register (SREG) is set
(one), the corresponding external pin interrupt is enabled. The Interrupt Sense Control bits in the
External Interrupt Control Registers – EICRA and EICRB – defines whether the external inter-
rupt is activated on rising or falling edge or level sensed. Activity on any of these pins will trigger
an interrupt request even if the pin is enabled as an output. This provides a way of generating a
software interrupt.
External Interrupt Flag
Register – EIFR
Bit
Read/ W rite
Initial Value
7
INTF7
R/ W
0
6
INTF6
R/ W
0
5
INTF5
R/ W
0
4
INTF4
R/ W
0
3
INTF3
R/ W
0
2
INTF2
R/ W
0
1
INTF1
R/ W
0
0
IINTF0
R/ W
0
EIFR
? Bits 7..0 – INTF7 - INTF0: External Interrupt Flags 7 - 0
W hen an edge or logic change on the INT7:0 pin triggers an interrupt request, INTF7:0 becomes
set (one). If the I-bit in SREG and the corresponding interrupt enable bit, INT7:0 in EIMSK, are
set (one), the MCU will jump to the 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. These flags are
always cleared when INT7:0 are configured as level interrupt. Note that when entering sleep
mode with the INT3:0 interrupts disabled, the input buffers on these pins will be disabled. This
may cause a logic change in internal signals which will set the INTF3:0 flags. See “Digital Input
Enable and Sleep Modes” on page 69 for more information.
91
2467X–AVR–06/11
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