Datasheet

271
2466T–AVR–07/10
ATmega16(L)
Figure 132. Mapping between BS1, BS2 and the Fuse- and Lock Bits during Read
Reading the Signature
Bytes
The algorithm for reading the Signature bytes is as follows (refer to “Programming the Flash” on
page 266 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”.
Reading the
Calibration Byte
The algorithm for reading the Calibration byte is as follows (refer to “Programming the Flash” on
page 266 for details on Command and Address loading):
1. A: Load Command “0000 1000”.
2. B: Load Address Low Byte, $00.
3. Set OE
to “0”, and BS1 to “1”. The Calibration byte can now be read at DATA.
4. Set OE
to “1”.
Parallel Programming
Characteristics
Figure 133. Parallel Programming Timing, Including some General Timing Requirements
Fuse Low Byte
Lock Bits
0
1
BS2
Fuse High Byte
0
1
BS1
DATA
Data & Contol
(DATA, XA0/1, BS1, BS2)
XTAL1
t
XHXL
t
WL WH
t
DVXH
t
XLDX
t
PLWL
t
WLRH
WR
RDY/BSY
PAGEL
t
PHPL
t
PLBX
t
BVPH
t
XLWL
t
WLBX
t
BVWL
WLRL