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ATmega165 Arkusz danych(PDF) 52 Page - ATMEL Corporation

Numer części ATmega165
Szczegółowy opis  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  336 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega165 Arkusz danych(HTML) 52 Page - ATMEL Corporation

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ATmega165/V
2573G–AVR–07/09
External Interrupt Control
Register A – EICRA
The External Interrupt Control Register A contains control bits for interrupt sense
control.
• 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 Table 24. 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.
Bit
7654
321
0
–
–
–
–
–
–
ISC01
ISC00
EICRA
Read/Write
R
RRRR
R
R/W
R/W
Initial Value
0000
000
0
Table 24. 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.



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