The AVR Control and Status Register provides information about the reset source that caused the AVR to reset.
· Bit 7..4 – Res: Reserved
Reserved bits, read operations return a value of zero.
· Bit 3 – WDRF: Watchdog reset flag
Set when a watchdog reset occurs. A power-on reset will clear it to zero, and it can also be cleared by writing a “0”.
· Bit 2 – BORF: Brownout detect reset flag
Set when a brownout detect reset occurs. A power-on reset will clear it to zero, and it can also be cleared by writing a “0”.
· Bit 1 – EXTRF: External reset flag
Set when an external reset occurs. A power-on reset will clear it to zero, and it can also be cleared by writing a “0”.
· Bit 0 – PORF: Power-on reset flag
Set when a power-on reset occurs on the ATtiny13. It can only be cleared by writing "0". In order to use these reset flags to identify a reset condition, the user should read the data of this register as early as possible and then reset it. If this register is reset before other resets occur, the source of subsequent resets can be understood by checking the reset flags.
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