Rainbow-electronics ATmega8515L Bedienungsanleitung PDF herunterladen (Seite 185)

185

ATmega8515(L)

2512A–AVR–04/02

1. A:LoadCommand “0100 0000”.

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

3. Set BS1 to “1” andBS2to“0”.Thisselectshighdata byte.

4. Give WR

a negative pulseandwait for RDY/BSY to go high.

5. Set BS1to“0”.Thisselectslowdata byte.

Figure 78. Programming the FusesWaveforms

Programming the Lock Bits Thealgorithm forprogramming the Lock bits is asfollows (refer to “Programming the

Flash”onpage 181 fordetails on Command andData loading):

1. A:LoadCommand “0010 0000”.

2. C: LoadData LowByte. Bit n = “0” programs the Lock bit.

3. Give WR

a negative pulseandwait for RDY/BSY to go high.

The Lock bitscan only be clearedbyexecuting ChipErase.

Reading the Fuse and Lock

Bits

Thealgorithm forreading the FuseandLock bits is asfollows (refer to “Programming

the Flash”onpage 181 fordetails on Commandloading):

1. A:LoadCommand “0000 0100”.

2. Set OE

to “0”,BS2to“0”andBS1to“0”.The status of the Fuse Lowbitscan

nowbe read at DATA (“0” meansprogrammed).

3. Set OE

to “0”,BS2to“1”andBS1to“1”.The status of the Fuse Highbitscan

nowbe read at DATA (“0” meansprogrammed).

4. Set OE

to “0”,BS2 to “0” andBS1to“1”.The status of the Lock bitscan nowbe

read at DATA (“0” meansprogrammed).

5. Set OE

to “1”.

RDY/BSY

RESET +12V

PAGEL

BS2

$40

DATA

DATA XX

XA1

XA0

BS1

XTAL1

$40 DATA XX

Write Fuse Low byte Write Fuse High byte

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