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ATTINY2313 Datasheet(PDF) 37 Page - ATMEL Corporation

Part No. ATTINY2313
Description  8-bit AVR Microcontroller with 2K Bytes In-System Programmable Flash
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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 37 page
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37
ATtiny2313/V
2543C–AVR–12/03
Watchdog Reset
When the Watchdog times out, it will generate a short reset pulse of one CK cycle dura-
tion. On the falling edge of this pulse, the delay timer starts counting the Time-out period
t
TOUT. Refer to page 44 for details on operation of the Watchdog Timer.
Figure 19. Watchdog Reset During Operation
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
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 MCUSR 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
6
54321
0
WDRF
BORF
EXTRF
PORF
MCUSR
Read/Write
R
R
R
R
R/W
R/W
R/W
R/W
Initial Value
0
0
0
See Bit Description




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