Rainbow-electronics ATmega64C1 Manual do Utilizador descarregar pdf (Página 300)

300

7647A–AVR–02/08

ATmega32/64/M1/C1

Figure 24-4. Programming the EEPROM Waveforms

24.8.6 Reading the Flash

The algorithm for reading the Flash memory is as follows (refer to “Programming the Flash” on

page 297 for details on Command and Address loading):

1. A: Load Command “0000 0010”.

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 Flash word low byte can now be read at DATA.

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

6. Set OE

to “1”.

24.8.7 Reading the EEPROM

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

on page 297 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”.

24.8.8 Programming the Fuse Low Bits

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

on page 297 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.

24.8.9 Programming the Fuse High Bits

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

Flash” on page 297 for details on Command and Data loading):

RDY/BSY

RESET +12V

PAGEL

BS2

0x11 ADDR. HIGH

DATA

ADDR. LOW DATA ADDR. LOW DATA XX

XA1

XA0

BS1

XTAL1

AGBCEB C EL

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