AT90SCR100 datasheet(379/433 Pages) ATMEL

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TPR0327AY–SMS–30Jan09

AT90SCR100

29.2

Fuse Bits

The AT90SCR100 has four Fuse bytes. Table 29-3 - Table 29-5 describe briefly the functionality

of all the fuses and how they are mapped into the Fuse bytes. Note that the fuses are read as

logical zero, “0”, if they are programmed.

Notes: 1. Refer to Table 9-2 on page 54 to get decoding of BODENABLE bit.

Notes: 1. Never ship a product with the OCDEN Fuse programmed regardless of the setting of Lock bits

and JTAGEN Fuse. A programmed OCDEN Fuse enables some parts of the clock system to

be running in all sleep modes. This may increase the power consumption.

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

3. See “WDTCSR – Watchdog Timer Control Register” on page 61 for details.

4. The default value of BOOTSZ1..0 results in maximum Boot Size. See Table 28-7 on page 376

for details

Table 29-3.

Extended Fuse Byte

Fuse Low Byte

Bit No

Description

Default Value

–7

–

–6

–

–5

–

–4

–

–3

–

–2

–

–1

–

BODENABLE(1)

Brown-out Detector Enable Control

1 (unprogrammed)

Table 29-4.

Fuse High Byte

Bit No

Description

Default Value

OCDEN(1)

Enable OCD

1 (unprogrammed, OCD

disabled)

JTAGEN

Enable JTAG

0 (programmed, JTAG

enabled)

SPIEN(2)

Enable Serial Program and Data

Downloading

0 (programmed, SPI prog.

enabled)

WDTON(3)

Watchdog Timer always on

1 (unprogrammed)

EESAVE

EEPROM memory is preserved

through the Chip Erase

1 (unprogrammed, EEPROM

not preserved)

BOOTSZ1

Select Boot Size (see Table 28-7 for

details)

0 (programmed)(4)

BOOTSZ0

Select Boot Size (see Table 28-7 for

details)

0 (programmed)(4)

BOOTRST

Select Reset Vector

1 (unprogrammed)

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