Rainbow-electronics ATmega128L Manual de usuario descargar pdf (Pagina 289)

289

ATmega128(L)

2467B–09/01

Programming the Fuse High

Bits

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

the Flash” on page 285

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'. 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.

Programming the Extended

Fuse Bits

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

“Program-

ming the Flash” on page 285

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 BS2 to “1” and BS1 to “0”. 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.

Programming the Lock Bits The algorithm for programming the Lock bits is as follows (refer to

“Programming the

Flash” on page 285

for details on Command and Data loading):

1. A: Load Command “0010 0000”.

2. C: Load Data Low Byte. Bit n = “0” programs the Lock bit.

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

The Lock bits can only be cleared by executing Chip Erase.

Reading the Fuse and Lock

Bits

The algorithm for reading the Fuse and Lock bits is as follows (refer to

“Programming

the Flash” on page 285

for details on Command loading):

1. A: Load Command “0000 0100”.

2. Set OE to “0”, BS2 to “0” and BS1 to “0”. The status of the Fuse Low bits can

now be read at DATA (“0” means programmed).

3. Set OE

to “0”, BS2 to “1” and BS1 to “1”. The status of the Fuse High bits can

now be read at DATA (“0” means programmed).

4. Set OE

to “0”, BS2 to “1” and BS1 to “0”. The status of the Extended Fuse bits

can now be read at DATA (“0” means programmed).

5. Set OE

to “0”, BS2 to “0” and BS1 to “1”. The status of the Lock bits can now be

read at DATA (“0” means programmed).

6. Set OE

to “1”.

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Rainbow-electronics ATmega128L Manual de usuario Pagina 289

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Rainbow-electronics ATmega128L Manual de usuario Pagina 289

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