ATtiny44 datasheet(160/236 Pages) ATMEL

160 / 236 page

160

8006H–AVR–10/09

ATtiny24/44/84

19.2

Fuse Bytes

The ATtiny24/44/84 have three fuse bytes. Table 19-3, Table 19-4 and Table 19-5 briefly

describe 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. Enables SPM instruction. See “Self-Programming the Flash” on page 153.

Notes:

1. See “Alternate Functions of Port B” on page 65 for description of RSTDISBL and DWEN

Fuses. After programming the RSTDISBL fuse, high-voltage serial programming must be used

to change fuses and allow further programming.

2. DWEN must be unprogrammed when Lock Bit security is required. See “Program And Data

Memory Lock Bits” on page 159.

3. The SPIEN Fuse is not accessible in SPI programming mode.

4. Programming this fues will disable the Watchdog Timer Interrupt. See “WDT Configuration as

a Function of the Fuse Settings of WDTON” on page 43 for details.

5. See Table 20-7 on page 179 for BODLEVEL Fuse decoding.

Table 19-3.

Fuse Extended Byte

Bit No

Description

Default Value

1 (unprogrammed)

SELFPRGEN (1)

Self-Programming Enable

1 (unprogrammed)

Table 19-4.

Fuse High Byte

Bit No

Description

Default Value

RSTDISBL (1)

External Reset disable

1 (unprogrammed)

DWEN (2)

DebugWIRE Enable

1 (unprogrammed)

SPIEN (3)

Enable Serial Program and Data

Downloading

0 (programmed, SPI prog.

enabled)

WDTON (4)

Watchdog Timer always on

1 (unprogrammed)

EESAVE

EEPROM memory is preserved through

the Chip Erase

1 (unprogrammed,

EEPROM not preserved)

BODLEVEL2 (5)

Brown-out Detector trigger level

1 (unprogrammed)

BODLEVEL1 (5)

Brown-out Detector trigger level

1 (unprogrammed)

BODLEVEL0 (5)

Brown-out Detector trigger level

1 (unprogrammed)

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