ATmega8A-AU datasheet(41/307 Pages) ATMEL

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ATmega8A-AU Datasheet(PDF) 41 Page - ATMEL Corporation

Part #	ATmega8A-AU

Description	8-bit with 8K Bytes In-System Programmable Flash

Download	307 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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41 / 307 page

8159C–AVR–07/09

ATmega8A

ADC is used. To reduce power consumption in Power-down mode, the user can avoid the three

conditions above to ensure that the reference is turned off before entering Power-down mode.

10.4

Watchdog Timer

The Watchdog Timer is clocked from a separate On-chip Oscillator which runs at 1 MHz. This is

the typical value at V

CC = 5V. See characterization data for typical values at other VCC levels. By

controlling the Watchdog Timer prescaler, the Watchdog Reset interval can be adjusted as

shown in Table 10-7 on page 41. The WDR – Watchdog Reset – instruction resets the Watch-

dog Timer. The Watchdog Timer is also reset when it is disabled and when a Chip Reset occurs.

Eight different clock cycle periods can be selected to determine the reset period. If the reset

period expires without another Watchdog Reset, the ATmega8A resets and executes from the

Reset Vector. For timing details on the Watchdog Reset, refer to “Watchdog Reset” on page 40.

To prevent unintentional disabling of the Watchdog, a special turn-off sequence must be fol-

lowed when the Watchdog is disabled. Refer to the description of the Watchdog Timer Control

Figure 10-7. Watchdog Timer

WATCHDOG

OSCILLATOR

Manufacturer	Part #	Datasheet	Description
ATMEL Corporation	ATMEGA8A	7Mb / 320P	8-bit Atmel Microcontroller with 8KB In-System Programmable Flash
	ATMEGA8A	485Kb / 19P	8-bit with 8K Bytes In-System Programmable Flash
	ATMEGA8A	7Mb / 320P	8-bit Atmel Microcontroller with 8KB In-System Programmable Flash

Manufacturer	Part #	Datasheet	Description
ATMEL Corporation	ATMEGA8	263Kb / 23P	8-bit with 8K Bytes In-System Programmable Flash
	ATMEGA8	4Mb / 308P	8-bit with 8K Bytes In-System Programmable Flash
	ATMEGA8A	485Kb / 19P	8-bit with 8K Bytes In-System Programmable Flash
	ATMEGA8	520Kb / 25P	8-bit with 8K Bytes In-System Programmable Flash
	ATMEGA48V	3Mb / 374P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	ATMEGA88	369Kb / 10P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	AT89LP51	4Mb / 113P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	ATMEGA8515	1Mb / 257P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	AT89S52	576Kb / 38P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	ATMEGA88	210Kb / 20P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

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