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ATMEGA8535-16AC Folha de dados(PDF) 69 Page - ATMEL Corporation

Nome de Peças ATMEGA8535-16AC
Descrição Electrónicos  8-bit Microcontrolle with 8K Bytes In-System Programmable Flash
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

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ATmega8535(L)
2502K–AVR–10/06
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 Table 36. 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.
MCU Control and Status
Register – MCUCSR
• Bit 6 – ISC2: Interrupt Sense Control 2
The asynchronous External Interrupt 2 is activated by the external pin INT2 if the SREG
I-bit and the corresponding interrupt mask in GICR are set. If ISC2 is written to zero, a
falling edge on INT2 activates the interrupt. If ISC2 is written to one, a rising edge on
INT2 activates the interrupt. Edges on INT2 are registered asynchronously. Pulses on
INT2 wider than the minimum pulse width given in Table 37 will generate an interrupt.
Shorter pulses are not guaranteed to generate an interrupt. When changing the ISC2
bit, an interrupt can occur. Therefore, it is recommended to first disable INT2 by clearing
its Interrupt Enable bit in the GICR Register. Then, the ISC2 bit can be changed. Finally,
the INT2 Interrupt Flag should be cleared by writing a logical one to its Interrupt Flag bit
(INTF2) in the GIFR Register before the interrupt is re-enabled.
General Interrupt Control
Register – GICR
• 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 external 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 the 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.
Table 36. 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.
Bit
765
4321
0
–ISC2
WDRF
BORF
EXTRF
PORF
MCUCSR
Read/Write
R/W
R/W
R
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
See Bit Description
Table 37. Asynchronous External Interrupt Characteristics
Symbol
Parameter
Min
Typ
Max
Units
tINT
Minimum pulse width for asynchronous external
interrupt
50
ns
Bit
7
654
32
10
INT1
INT0
INT2
IVSEL
IVCE
GICR
Read/Write
R/W
R/W
R/W
R
R
R
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0


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