ATtiny43U datasheet(140/182 Pages) ATMEL

140 / 182 page

140

8048B–AVR–03/09

ATtiny43U

19.2

Fuse Bytes

The ATtiny43U has 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 133.

Notes:

1. See “Alternate Functions of Port B” on page 74 for description of RSTDISBL and DWEN

Fuses. When programming the RSTDISBL Fuse, TBD programming has to be used to change

fuses to perform further programming

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

Memory Lock Bits” on page 139.

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

4. See “WDT Configuration as a Function of the Fuse Settings of WDTON” on page 52 for

details.

5. See Table 20-5 on page 158 for BODLEVEL Fuse decoding.

Table 19-3.

Fuse Extended Byte

Fuse High 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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