Atmel ATmega328P Xplained Mini MEGA328P-XMINI MEGA328P-XMINI Ficha De Dados
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MEGA328P-XMINI
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ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]
Atmel-8271H-AVR- ATmega-Datasheet_08/2014
13.2
Register Description
13.2.1 EICRA – External Interrupt Control Register A
The External Interrupt Control Register A contains control bits for interrupt sense control.
• Bit 7:4 – Reserved
These bits are unused bits in the ATmega48A/PA/88A/PA/168A/PA/328/P, and will always read as zero.
• Bit 3, 2 – ISC11, ISC10: Interrupt Sense Control 1 Bit 1 and Bit 0
The External Interrupt 1 is activated by the external pin INT1 if the SREG I-flag and the corresponding interrupt
mask are set. The level and edges on the external INT1 pin that activate the interrupt are defined in
mask are set. The level and edges on the external INT1 pin that activate the interrupt are defined in
.
The value on the INT1 pin is sampled before detecting edges. If edge or toggle interrupt is selected, pulses that
last longer than one clock period will generate an interrupt. Shorter pulses are not guaranteed to generate an
interrupt. If low level interrupt is selected, the low level must be held until the completion of the currently
executing instruction to generate an interrupt.
last longer than one clock period will generate an interrupt. Shorter pulses are not guaranteed to generate an
interrupt. If low level interrupt is selected, the low level must be held until the completion of the currently
executing instruction to generate an interrupt.
• Bit 1, 0 – ISC01, ISC00: Interrupt Sense Control 0 Bit 1 and Bit 0
The External Interrupt 0 is activated by the external pin INT0 if the SREG I-flag and the corresponding interrupt
mask are set. The level and edges on the external INT0 pin that activate the interrupt are defined in
mask are set. The level and edges on the external INT0 pin that activate the interrupt are defined in
.
The value on the INT0 pin is sampled before detecting edges. If edge or toggle interrupt is selected, pulses that
last longer than one clock period will generate an interrupt. Shorter pulses are not guaranteed to generate an
interrupt. If low level interrupt is selected, the low level must be held until the completion of the currently
executing instruction to generate an interrupt.
last longer than one clock period will generate an interrupt. Shorter pulses are not guaranteed to generate an
interrupt. If low level interrupt is selected, the low level must be held until the completion of the currently
executing instruction to generate an interrupt.
Bit
7
6
5
4
3
2
1
0
–
–
–
–
ISC11
ISC10
ISC01
ISC00
EICRA
Read/Write
R
R
R
R
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 13-1.
Interrupt 1 Sense Control
ISC11
ISC10
Description
0
0
The low level of INT1 generates an interrupt request.
0
1
Any logical change on INT1 generates an interrupt request.
1
0
The falling edge of INT1 generates an interrupt request.
1
1
The rising edge of INT1 generates an interrupt request.
Table 13-2.
Interrupt 0 Sense Control
ISC01
ISC00
Description
0
0
The low level of INT0 generates an interrupt request.
0
1
Any logical change on INT0 generates an interrupt request.
1
0
The falling edge of INT0 generates an interrupt request.
1
1
The rising edge of INT0 generates an interrupt request.