Rainbow-electronics ATtiny2313 Manual de usuario descargar pdf (Pagina 161)

161

ATtiny2313

2543A–AVR–08/03

Fuse Bits The ATtiny2313 has three Fuse bytes. Table 68 and Table 69 describe briefly the func-

tionality 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.

Note: 1. The SPIEN Fuse is not accessible in serial programming mode.

2. See “Watchdog Timer Control Register – WDTCR” on page 40 for details.

3. Never ship a product with the DWEN Fuse programmed regardless of the setting of

Lock bits. A programmed DWEN Fuse enables some parts of the clock system to be

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

4. See Table 16 on page 36 for BODLEVEL Fuse decoding.

5. See “Alternate Functions of Port A” on page 54 for description of RSTDISBL Fuse.

Table 67. Fuse Extended Byte

Fuse Extended

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)

SPMEN 0 Self Programming Enable 1 (unprogrammed)

Table 68. Fuse High Byte

Fuse High Byte

Bit

No Description Default Value

DWEN

(3)

7 debugWIRE Enable 1 (unprogrammed)

EESAVE 6

EEPROM memory is preserved

through the Chip Erase

1 (unprogrammed, EEPROM

not preserved)

SPIEN

(1)

Enable Serial Program and Data

Downloading

0 (programmed, SPI prog.

enabled)

WDTON

(2)

4 Watchdog Timer always on 1 (unprogrammed)

BODLEVEL2

(4)

3 Brown-out Detector trigger level 1 (unprogrammed)

BODLEVEL1

(4)

2 Brown-out Detector trigger level 1 (unprogrammed)

BODLEVEL0

(4)

1 Brown-out Detector trigger level 1 (unprogrammed)

RSTDISBL

(5)

0 External Reset disable 1 (unprogrammed)

1 2 ... 156 157 158 159 160 161 162 163 164 165 166 ... 210 211

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