Rainbow-electronics ATtiny2313 Manuel d'utilisateur télécharger pdf (Page 169)

169

ATtiny2313

2543A–AVR–08/03

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

Flash” on page 166 for details on Command and Address loading):

1. A: Load Command “0000 0011”.

2. G: Load Address High Byte (0x00 - 0xFF).

3. B: Load Address Low Byte (0x00 - 0xFF).

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 166 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. 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 166 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.

Programming the Extended

Fuse Bits

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

ming the Flash” on page 166 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 72. Programming the FUSES Waveforms

RDY/BSY

RESET +12V

PAGEL

0x40

DATA

DATA XX

XA1

XA0

BS1

XTAL1

0x40 DATA XX

Write Fuse Low byte Write Fuse high byte

0x40 DATA XX

Write Extended Fuse byte

BS2

1 2 ... 164 165 166 167 168 169 170 171 172 173 174 ... 210 211

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Rainbow-electronics ATtiny2313 Manuel d'utilisateur Page 169

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