XMEGAD datasheet(28/309 Pages) ATMEL

28 / 309 page

8210B–AVR–04/10

XMEGA D

4.13

4.13.1

FUSEBYTE1 - Non-Volatile Memory Fuse Byte1 - Watchdog Configuration

• Bit 7:4 - WDWPER[3:0]: Watchdog Window Timeout Period

The WDWPER fuse bits are used to set initial value of the closed window for the Watchdog

Timer in Window Mode. During reset these fuse bits are automatically written to the WPER bits

Watchdog Window Mode Control Register, refer to Section 11.7.2 ”WINCTRL – Window Mode

Control Register” on page 120 for details.

• BIT 3:0 - WDPER[3:0]: Watchdog Timeout Period

The WDPER fuse bits are used to set initial value of the Watchdog Timeout Period. During reset

these fuse bits are automatically written to the PER bits in the Watchdog Control Register, refer

to Section 11.7.1 ”CTRL – Watchdog Timer Control Register” on page 119 for details.

4.13.2

FUSEBYTE2 - Non-Volatile Memory Fuse Byte2 - Reset Configuration

• Bit 7 - Reserved

This fuse bit is reserved. For compatibility with future devices, always write this bit to one when

this register is written.

• Bit 6 - BOOTRST: Boot Loader Section Reset Vector

The BOOTRST fuse can be programmed so the Reset Vector is pointing to the first address in

the Boot Loader Flash Section. In this case, the device will start executing from the from Boot

Loader Flash Section after reset.

• Bit 5:2 - Reserved

These fuse bits are reserved. For compatibility with future devices, always write these bits to one

when this register is written.

Bit

5432

+0x01

WDWPER[3:0]

WDPER[3:0]

FUSEBYTE1

Read/Write

R/W

Initial Value

0000

Bit

3210

+0x02

–BOOTRST

–

BODPD[1:0]

FUSEBYTE2

Read/Write

R/W

Initial Value

1111

Table 4-1.

Boot Reset Fuse

BOOTRST

Reset Address

Reset Vector = Boot Loader Reset

Reset Vector = Application Reset (address 0x0000)

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