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ATMEGA8-16PU Fiches technique(PDF) 41 Page - ATMEL Corporation

No de pièce ATMEGA8-16PU
Description  8-bit with 8K Bytes In-System Programmable Flash
Download  308 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA8-16PU Fiches technique(HTML) 41 Page - ATMEL Corporation

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41
2486T–AVR–05/08
ATmega8(L)
Watchdog Reset
When the Watchdog times out, it will generate a short reset pulse of 1 CK cycle duration. On the
falling edge of this pulse, the delay timer starts counting the time-out period t
TOUT. Refer to page
43 for details on operation of the Watchdog Timer.
Figure 19. Watchdog Reset During Operation
MCU Control and
Status Register –
MCUCSR
The MCU Control and Status Register provides information on which reset source caused an
MCU Reset.
• Bit 7..4 – Res: Reserved Bits
These bits are reserved bits in the ATmega8 and always read as zero.
• 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
This bit is set if an External Reset occurs. The bit is reset by a Power-on Reset, or by writing a
logic zero to the flag.
• Bit 0 – PORF: Power-on Reset Flag
This bit is set if a Power-on Reset occurs. The bit is reset only by writing a logic zero to the flag.
To make use of the Reset Flags to identify a reset condition, the user should read and then reset
the MCUCSR as early as possible in the program. If the register is cleared before another reset
occurs, the source of the reset can be found by examining the Reset Flags.
CK
CC
Bit
7
65
43
21
0
WDRF
BORF
EXTRF
PORF
MCUCSR
Read/Write
R
R
R
R
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
See Bit Description


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