Rainbow-electronics ATmega32L Manuel d'utilisateur télécharger pdf (Page 264)

264

ATmega32(L)

2503C–AVR–10/02

5. Set BS1 to “1”. The Flash word high byte can now be read at DATA.

6. Set OE to “1”.

Reading the EEPROM The algorithm for reading the EEPROM memory is as follows (refer to “Programming the

Flash” on page 260 for details on Command and Address loading):

1. A: Load Command “0000 0011”.

2. G: Load Address High Byte ($00 - $FF)

3. B: Load Address Low Byte ($00 - $FF)

4. Set OE

to “0”, and BS1 to “0”. The EEPROM Data byte can now be read at

DATA.

5. Set OE

to “1”.

Programming the Fuse Low

Bits

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

the Flash” on page 260 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 “0”.

4. Give WR

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

Programming the Fuse High

Bits

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

the Flash” on page 260 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.

Figure 131. Programming the Fuses

RDY/BSY

RESET +12V

PAGEL

$40

DATA

DATA XX

XA1

XA0

BS1

XTAL1

$40 DATA XX

Write Fuse Low byte Write Fuse high byte

BS2

1 2 ... 259 260 261 262 263 264 265 266 267 268 269 ... 312 313

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Rainbow-electronics ATmega32L Manuel d'utilisateur Page 264

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