Rainbow-electronics ATmega8515L Manual do Utilizador descarregar pdf (Página 184)

184

ATmega8515(L)

2512A–AVR–04/02

Figure 77. Programming the EEPROM Waveforms

Reading the Flash Thealgorithm forreading the Flash memory is asfollows (refer to “Programming the

Flash”onpage 181 fordetails on Command and Address loading):

1. A:LoadCommand “0000 0010”.

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

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

4. Set OE

to “0”, andBS1to“0”.The Flash word lowbyte can nowbe read at DATA.

5. Set BS1to“1”.The Flash word highbyte can nowbe read at DATA.

6. Set OE

to “1”.

Reading the EEPROM Thealgorithm forreading the EEPROM memory is asfollows (refer to “Programming the

Flash”onpage 181 fordetails on Command and Address loading):

1. A:LoadCommand “0000 0011”.

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

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

4. Set OE

to “0”, andBS1to“0”.The EEPROM Data byte can nowbe read at

DATA.

5. Set OE

to “1”.

Programming the Fuse Low

Bits

Thealgorithm forprogramming the Fuse Lowbits is asfollows (refer to “Programming

the Flash”onpage 181 fordetails on Command andData loading):

1. A:LoadCommand “0100 0000”.

2. C: LoadData LowByte. Bit n = “0” programs andbit n = “1” erases the Fuse bit.

3. Set BS1 to “0” andBS2to“0”.Thisselectslowdata byte.

4. Give WR

a negative pulseandwait for RDY/BSY to go high.

Programming the Fuse High

Bits

Thealgorithm forprogramming the Fuse Highbits is asfollows (refer to “Programming

the Flash”onpage 181 fordetails on Command andData loading):

RDY/BSY

RESET +12V

PAGEL

BS2

$10 ADDR. HIGH

DATA

ADDR. LOW DATA ADDR. LOW DATA XX

XA1

XA0

BS1

XTAL1

AGBCEB C EL

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