Rainbow-electronics ATmega128L Uživatelský manuál stáhnout pdf (Strana 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”.

1 2 ... 284 285 286 287 288 289 290 291 292 293 294 ... 330 331

Komentáře k této Příručce

Žádné komentáře

Rainbow-electronics ATmega128L Uživatelský manuál Strana 289

Komentáře k této Příručce

Související produkty a manuály pro Senzory Rainbow-electronics ATmega128L