Rainbow-electronics ATtiny26L Manual do Utilizador descarregar pdf (Página 116)

116

ATtiny26(L)

1477B–AVR–04/02

Programming the Fuse High

Bits

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

the Flash” on page 112 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 62. Programming the Fuse Waveforms

Programming the Lock Bits The algorithm for programming the Lock bits is as follows (refer to “Programming the

Flash” on page 112 for details on Command and Data loading):

1. A: Load Command “0010 0000”.

2. C: Load Data Low Byte. Bit n = “0” programs the Lock bit.

3. Give WR

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

The Lock bits can only be cleared by executing Chip Erase.

Reading the Fuse and Lock

Bits

The algorithm for reading the Fuse and Lock bits is as follows (refer to “Programming

the Flash” on page 112 for details on Command loading):

1. A: Load Command “0000 0100”.

2. Set OE

to “0”, BS2 to “0”, and BS1 to “0”. The status of the Fuse Low bits can

now be read at DATA (“0” means programmed).

3. Set OE

to “0”, BS2 to “1”, and BS1 to “1”. The status of the Fuse High bits can

now be read at DATA (“0” means programmed).

4. Set OE

to “0”, BS2 to “0”, and BS1 to “1”. The status of the Lock bits can now be

read at DATA (“0” means programmed).

5. Set OE

to “1”.

RDY/BSY

RESET +12V

$40

DATA

DATA XX

XA1/BS2

XA0

PAGEL/BS1

XTAL1

$40 DATA XX

Write Fuse Low Byte Write Fuse High Byte

1 2 ... 111 112 113 114 115 116 117 118 119 120 121 ... 150 151

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