Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 48)

100

101

7647A–AVR–02/08

ATmega32/64/M1/C1

Figure 7-5. Brown-out Reset During Operation

7.2.4 Watchdog 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 50 for details on operation of the Watchdog Timer.

Figure 7-6. Watchdog Reset During Operation

7.2.5 MCU Status Register – MCUSR

The MCU Status Register provides information on which reset source caused an MCU reset.

• Bit 3 – WDRF: Watchdog Reset Flag

This bit is set if a Watchdog Reset occurs. The bit is reset by a Power-on Reset, or by writing a

logic zero to the flag.

• Bit 2 – BORF: Brown-out Reset Flag

This bit is set if a Brown-out Reset occurs. The bit is reset by a Power-on Reset, or by writing a

logic zero to the flag.

• Bit 1 – EXTRF: External Reset Flag

RESET

TIME-OUT

INTERNAL

RESET

BOT-

BOT+

TOUT

Bit 76543210

– – – – WDRF BORF EXTRF PORF MCUSR

Read/Write R R R R R/W R/W R/W R/W

Initial Value 0 0 0 0 See Bit Description

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 365 366

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 48

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