ATA8742-PXQW【PDF 181/238 页】MCU W/TRANSMITTER ASK/FSK 24QFN

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Sheet目录52

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181

9151AINDCO07/09

ATA8742

28.2 Fuse Bytes

The ATtiny24/44/84 has three Fuse bytes. Table 28-4 on page 181 to Table 28-5 on page 182

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 84 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

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

Memory Lock Bits on page 180.

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 60 for

details.

5. See Table 29-5 on page 198 for BODLEVEL Fuse decoding.

Table 28-3. Fuse Extended Byte

Fuse High Byte

Bit No Description

Default Value

1 (unprogrammed)

SELFPRGEN

Self-Programming Enable

1 (unprogrammed)

Table 28-4. Fuse High Byte

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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