Atmel XMEGA B, User Manual

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111 XMEGA B [DATASHEET]
8291B–AVR–01/2013
9.5 Register Description
9.5.1 STATUS – Status register

Bit 7:6 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to zero
when this register is written.

Bit 5 – SRF: Software Reset Flag
This flag is set if a software reset occurs. The flag will be cleared by a power-on reset or by writing a one to the bit
location.
 Bit 4 – PDIRF: Program and Debug Interface Reset Flag
This flag is set if a programming interface reset occurs. The flag will be cleared by a power-on reset or by writing a one to
the bit location.

Bit 3 – WDRF: Watchdog Reset Flag
This flag is set if a watchdog reset occurs. The flag will be cleared by a power-on reset or by writing a one to the bit
location.

Bit 2 – BORF: Brownout Reset Flag
This flag is set if a brownout reset occurs. The flag will be cleared by a power-on reset or by writing a one to the bit
location.

Bit 1 – EXTRF: External Reset Flag
This flag is set if an external reset occurs. The flag will be cleared by a power-on reset or by writing a one to the bit
location.
 Bit 0 – PORF: Power On Reset Flag
This flag is set if a power-on reset occurs. Writing a one to the flag will clear the bit location.
9.5.2 CTRL – Control register
 Bit 7:1 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to zero
when this register is written.

Bit 0 – SWRST: Software Reset
Bit 7 6 5 4 3 2 1 0
+0x00
– – SRF PDIRF WDRF BORF EXTRF PORF
Read/Write R R R/W R/W R/W R/W R/W R/W
Initial Value - - - - - - - -
Bit 7 6 5 4 3 2 1 0
+0x01
– – – – – – – SWRST
Read/Write R R R R R R R R/W
Initial Value 0 0 0 0 0 0 0 0