Rainbow-electronics ATtiny861_V Manual do Utilizador descarregar pdf (Página 169)

169

2588B–AVR–11/06

ATtiny261/461/861

22.2 Fuse Bytes

The ATtiny261/461/861 has three Fuse bytes. Table 22-3, Table 22-4 and Table 22-5 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. See ”Alternate Functions of Port B” on page 61 for description of RSTDISBL and DWEN

Fuses.

2. DWEN must be unprogrammed when Lock Bit security is required. See Section “22.1” on page

168.

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

4. See ”WDTCR – Watchdog Timer Control Register” on page 44 for details.

5. See Table 23-4 on page 189 for BODLEVEL Fuse decoding.

6. When programming the RSTDISBL Fuse, High-voltage Serial programming has to be used to

change fuses to perform further programming.

Table 22-3. Fuse Extended Byte

Fuse High Byte Bit No Description Default Value

7 - 1 (unprogrammed)

6 - 1 (unprogrammed)

5 - 1 (unprogrammed)

4 - 1 (unprogrammed)

3 - 1 (unprogrammed)

2 - 1 (unprogrammed)

1 - 1 (unprogrammed)

SELFPRGEN 0 Self-Programming Enable 1 (unprogrammed)

Table 22-4. Fuse High Byte

Fuse High Byte Bit No Description Default Value

RSTDISBL

(1)

7 External Reset disable 1 (unprogrammed)

DWEN

(2)

6 DebugWIRE Enable 1 (unprogrammed)

SPIEN

(3)

Enable Serial Program and Data

Downloading

0 (programmed, SPI prog.

enabled)

WDTON

(4)

4 Watchdog Timer always on 1 (unprogrammed)

EESAVE 3

EEPROM memory is preserved

through the Chip Erase

1 (unprogrammed, EEPROM

not preserved)

BODLEVEL2

(5)

2 Brown-out Detector trigger level 1 (unprogrammed)

BODLEVEL1

(5)

1 Brown-out Detector trigger level 1 (unprogrammed)

BODLEVEL0

(5)

0 Brown-out Detector trigger level 1 (unprogrammed)

1 2 ... 164 165 166 167 168 169 170 171 172 173 174 ... 235 236

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