ATmega48 datasheet(45/340 Pages) ATMEL

No. de pieza	ATmega48

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

PDF	340 Pages

Scroll/Zoom	100%

Fabricante Electrónico	ATMEL [ATMEL Corporation]

Página de inicio	http://www.atmel.com

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45 / 340 page

7530H–AVR–02/09

ATmega48/88/168 Automotive

When the BOD is enabled, and V

CC decreases to a value below the trigger level (VBOT- in Figure

8-5), the Brown-out Reset is immediately activated. When V

CC increases above the trigger level

BOT+ in Figure 8-5), the delay counter starts the MCU after the Time-out period tTOUT has

expired.

The BOD circuit will only detect a drop in V

CC if the voltage stays below the trigger level for lon-

ger than t

BOD given in Table 8-1 on page 43.

Figure 8-5.

Brown-out Reset During Operation

8.0.6

Watchdog System Reset

When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On

the falling edge of this pulse, the delay timer starts counting the Time-out period t

TOUT. Refer to

page 47 for details on operation of the Watchdog Timer.

Figure 8-6.

Watchdog System Reset During Operation

Table 8-3.

Brown-out Characteristics

Symbol

Parameter

Min

Typ

Max

Units

VHYST

Brown-out Detector Hysteresis

BOD

Min Pulse Width on Brown-out Reset

VCC

RESET

TIME-OUT

INTERNAL

RESET

VBOT-

VBOT+

tTOUT

ATmega48 Datasheet(PDF) 45 Page - ATMEL Corporation

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