Rainbow Electronics AT90S2313 - Manual (Page 66)

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”, and BS to “0”. The selected signature byte can now be read at DATA.
3. Set OE to “1”.