ATmega48 datasheet(52/340 Pages) ATMEL

No. de pieza	ATmega48

Descripción Electrónicos	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

PDF	340 Pages

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Fabricante Electrónico	ATMEL [ATMEL Corporation]

Página de inicio	http://www.atmel.com

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52 / 340 page

7530H–AVR–02/09

ATmega48/88/168 Automotive

Interrupts

This section describes the specifics of the interrupt handling as performed in ATmega48/88/168.

For a general explanation of the AVR interrupt handling, refer to “Reset and Interrupt Handling”

on page 12.

The interrupt vectors in ATmega48, ATmega88 and ATmega168 are generally the same, with

the following differences:

• Each Interrupt Vector occupies two instruction words in ATmega168, and one instruction

word in ATmega48 and ATmega88.

• ATmega48 does not have a separate Boot Loader Section. In ATmega88 and ATmega168,

the Reset Vector is affected by the BOOTRST fuse, and the Interrupt Vector start address is

affected by the IVSEL bit in MCUCR.

Table 8-6.

Watchdog Timer Prescale Select

WDP3

WDP2

WDP1

WDP0

Number of WDT Oscillator

Cycles

Typical Time-out at

VCC = 5.0V

0000

2K (2048) cycles

16 ms

0001

4K (4096) cycles

32 ms

0010

8K (8192) cycles

64 ms

0011

16K (16384) cycles

0.125 s

0100

32K (32768) cycles

0.25 s

0101

64K (65536) cycles

0.5 s

0110

128K (131072) cycles

1.0 s

0111

256K (262144) cycles

2.0 s

1000

512K (524288) cycles

4.0 s

1001

1024K (1048576) cycles

8.0 s

1010

Reserved

1011

1100

1101

1110

1111

ATmega48 Datasheet(PDF) 52 Page - ATMEL Corporation

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