ATtiny43U datasheet(149/182 Pages) ATMEL

149 / 182 page

149

8048B–AVR–03/09

19.6.8

Programming the Fuse Low Bits

The algorithm for programming the Fuse Low bits is as follows (refer to “Programming the Flash”

on page 145 for details on Command and Data loading):

A: Load Command “0100 0000”.

C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.

Give WR a negative pulse and wait for RDY/BSY to go high.

19.6.9

Programming the Fuse High Bits

The algorithm for programming the Fuse High bits is as follows (refer to “Programming the

Flash” on page 145 for details on Command and Data loading):

A: Load Command “0100 0000”.

C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.

Set BS1 to “1” and BS2 to “0”. This selects high data byte.

Give WR a negative pulse and wait for RDY/BSY to go high.

Set BS1 to “0”. This selects low data byte.

19.6.10

Programming the Extended Fuse Bits

The algorithm for programming the Extended Fuse bits is as follows (refer to “Programming the

Flash” on page 145 for details on Command and Data loading):

1. A: Load Command “0100 0000”.

2. C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.

3. Set BS1 to “0” and BS2 to “1”. This selects extended data byte.

4. Give WR a negative pulse and wait for RDY/BSY to go high.

5. Set BS2 to “0”. This selects low data byte.

Figure 19-5. Programming the FUSES Waveforms

19.6.11

Programming the Lock Bits

The algorithm for programming the Lock bits is as follows (refer to “Programming the Flash” on

page 145 for details on Command and Data loading):

RDY/BSY

RESET +12V

0x40

DATA

XA1/BS2

XA0

PAGEL/BS1

CLKI

0x40

DATA

Write Fuse Low byte

Write Fuse high byte

0x40

DATA

Write Extended Fuse byte

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