ATMEGA128-16AU SL383 Atmel, ATMEGA128-16AU SL383 Datasheet - Page 298

• Manufacturer Part Number: ATMEGA128-16AU SL383
• Manufacturer: Atmel

Reading the Signature
Bytes
Reading the
Calibration Byte
Parallel Programming
Characteristics
298
ATmega128
4. Set OE to “0”, BS2 to “1”, and BS1 to “0”. The status of the Extended Fuse bits can now
5. Set OE to “0”, BS2 to “0”, and BS1 to “1”. The status of the Lock bits can now be read at
6. Set OE to “1”.
Figure 140. Mapping Between BS1, BS2 and the Fuse- and Lock Bits During Read
The algorithm for reading the Signature bytes is as follows (refer to Programming the Flash for
details on Command and Address loading):
1. A: Load Command “0000 1000”.
2. B: Load Address Low Byte ($00 - $02).
3. Set OE to “0”, and BS1 to “0”. The selected Signature byte can now be read at DATA.
4. Set OE to “1”.
The algorithm for reading the Calibration byte is as follows (refer to Programming the Flash for
details on Command and Address loading):
1. A: Load Command “0000 1000”.
2. B: Load Address Low Byte.
3. Set OE to “0”, and BS1 to “1”. The Calibration byte can now be read at DATA.
4. Set OE to “1”.
Figure 141. Parallel Programming Timing, Including some General Timing Requirements
be read at DATA (“0” means programmed).
DATA (“0” means programmed).
(DATA, XA0/1, BS1, BS2)
Data & Contol
Fuse Low Byte
Extended Fuse byte
RDY/BSY
PAGEL
Fuse high byte
XTAL1
Lock bits
WR
t
t
BVPH
DVXH
BS2
BS2
t
t
XHXL
PHPL
0
1
0
1
t
t
t
t
XLDX
PLBX
XLWL
PLWL
t
BVWL
BS1
t
WL WH
WLRL
0
1
t
WLBX
DATA
2467S–AVR–07/09
t
WLRH