Rainbow-electronics AT90S2313 Manual do Utilizador descarregar pdf (Página 66)

AT90S2313

0839I–AVR–06/02

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 63 for details on command loading):

1. A: Load Command “0000 0100”.

2. Set OE

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

read at DATA (“0” means programmed).

Bit 7 = Lock Bit1

Bit 6 = Lock Bit2

Bit 5 = SPIEN Fuse bit

Bit 0 = FSTRT Fuse bit

3. Set OE

to “1”.

Observe that BS needs to be set to “1”.

Reading the Signature Bytes The algorithm for reading the signature bytes is as follows (refer to “Programming the

Flash” on page 63 for details on command and address loading):

1. A: Load Command “0000 1000”.

2. C: Load Address Low Byte ($00 - $02).

Set OE

to “0”,andBSto“0”. The selected signature byte can now be read at DATA.

3. Set OE

to “1”.

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Rainbow-electronics AT90S2313 Manual do Utilizador Página 66