PIC16F872T-E/SO【PDF 48/167 页】IC MCU CMOS 20MHZ 2K FLSH 28SOIC

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142

8048C–AVR–02/12

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 135.

Notes:

1. See “Alternate Functions of Port B” on page 75 for description of RSTDISBL and DWEN

Fuses. When RSTDISBL fuse has been programmed, parallel programming must be used for

unprogramming the fuse and programming the device.

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

Memory Lock Bits” on page 141.

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 53 for

details.

5. See Table 20-5 on page 161 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

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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