PCIF0 datasheet(237/294 Pages) ATMEL

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237

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

22.2

Fuse Bits

The Atmel

® AVR® has three Fuse bytes. Table 22-3, Table 22-4 & Table 22-5 describe briefly

the functionality of all the fuses and how they are mapped into the Fuse bytes.

The SPM instruction is enabled for the whole Flash if the SELFPRGEN fuse is programmed

(“0”), otherwise it is disabled.

Note that the fuses are read as logical zero, “0”, if they are programmed.

Notes:

1. See ”Alternate Functions of Port B” on page 84. for description of RSTDISBL Fuse.

2. The SPIEN Fuse is not accessible in serial programming mode.

3. See ”Watchdog Timer Control Register - WDTCR” on page 61. for details.

4. See Table 23-5 on page 259 for BODLEVEL Fuse coding.

Table 22-3.

Extended Fuse Byte

Fuse Extended Byte

Bit No

Description

Default Value

–

1 (unprogrammed)

–

1 (unprogrammed)

–

1 (unprogrammed)

–

1 (unprogrammed)

–

1 (unprogrammed)

–

1 (unprogrammed)

–

1 (unprogrammed)

SELFPRGEN

Self Programming Enable

1 (unprogrammed)

Table 22-4.

Fuse High Byte

Bit No Description

Default Value

RSTDISBL(1)

External Reset Disable

1 (unprogrammed)

DWEN

DebugWIRE Enable

1 (unprogrammed)

SPIEN(2)

Enable Serial Program

and Data Downloading

0 (programmed,

SPI programming enabled)

WDTON(3)

Watchdog Timer always on

1 (unprogrammed)

EESAVE

EEPROM memory is preserved

through the Chip Erase

1 (unprogrammed,

EEPROM not preserved)

BODLEVEL2(4)

Brown-out Detector trigger level

1 (unprogrammed)

BODLEVEL1(4)

Brown-out Detector trigger level

1 (unprogrammed)

BODLEVEL0(4)

Brown-out Detector trigger level

1 (unprogrammed)

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