Rainbow-electronics ATtiny861_V Manual de usuario descargar pdf (Pagina 178)

178

2588B–AVR–11/06

ATtiny261/461/861

22.7.9 Programming the Fuse High Bits

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

Flash” on page 174 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 “1” and BS2 to “0”. This selects high data byte.

4. Give WR

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

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

22.7.10 Programming the Extended Fuse Bits

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

Flash” on page 174 for details on Command and Data loading):

1. 1. A: Load Command “0100 0000”.

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

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

4. 4. Give WR

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

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

Figure 22-5. Programming the FUSES Waveforms

RDY/BSY

RESET +12V

0x40

DATA

DATA XX

XA1/BS2

XA0

PAGEL/BS1

XTAL1

0x40 DATA XX

Write Fuse Low byte Write Fuse high byte

0x40 DATA XX

Write Extended Fuse byte

1 2 ... 173 174 175 176 177 178 179 180 181 182 183 ... 235 236

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Rainbow-electronics ATtiny861_V Manual de usuario Pagina 178