ATtiny13A datasheet(104/174 Pages) ATMEL

104 / 174 page

104

8126D–AVR–11/09

ATtiny13A

17.2 Fuse Bytes

The ATtiny13A has two fuse bytes. Table 17-3 on page 104 and Table 17-4 on page 104

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. Enables SPM instruction. See “Self-Programming the Flash” on page 98.

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

Memory Lock Bits” on page 103.

3. See Table 18-6 on page 120 for BODLEVEL fuse decoding.

4. See “Alternate Functions of Port B” on page 55 for description of RSTDISBL and DWEN fuses.

When programming the RSTDISBL fuse, High-voltage Serial programming has to be used to

change fuses to perform further programming.

Notes: 1. The SPIEN fuse is not accessible in SPI Programming mode.

2. Programming this fues will disable the Watchdog Timer Interrupt. See “Watchdog Timer” on

page 38 for details.

3. See “System Clock Prescaler” on page 26 for details.

4. The default value of SUT1..0 results in maximum start-up time for the default clock source.

See Table 18-3 on page 119 for details.

5. The default setting of CKSEL1..0 results in internal RC Oscillator @ 9.6 MHz. See Table 18-3

on page 119 for details.

Table 17-3.

Fuse High Byte

Fuse Bit

Bit No

Description

Default Value

–

1 (unprogrammed)

–

1 (unprogrammed)

–

1 (unprogrammed)

SELFPRGEN(1)

Self Programming Enable

1 (unprogrammed)

DWEN(2)

debugWire Enable

1 (unprogrammed)

BODLEVEL1(3)

Brown-out Detector trigger level

1 (unprogrammed)

BODLEVEL0(3)

Brown-out Detector trigger level

1 (unprogrammed)

RSTDISBL(4)

External Reset disable

1 (unprogrammed)

Table 17-4.

Fuse Low Byte

Fuse Bit

Bit No

Description

Default Value

SPIEN(1)

Enable Serial Programming and Data

Downloading

0 (programmed)

(SPI prog. enabled)

EESAVE

Preserve EEPROM memory through

Chip Erase

1 (unprogrammed)

(memory not preserved)

WDTON(2)

Watchdog Timer always on

1 (unprogrammed)

CKDIV8(3)

Divide clock by 8

0 (programmed)

SUT1(4)

Select start-up time

1 (unprogrammed)

SUT0(4)

Select start-up time

0 (programmed)

CKSEL1(5)

Select Clock source

1 (unprogrammed)

CKSEL0(5)

Select Clock source

0 (programmed)

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