Datasheet

1. Step A: Load Command “0000 1000”.
2. Step B: Load Address Low Byte (0x00 - 0x02).
3. Set OE to “0”, and BS1 to “0”. The selected Signature byte can now be read at DATA.
4. Set OE to “1”.
29.7.13 Reading the Calibration Byte
The algorithm for reading the Calibration byte is as follows (Please refer to Programming the Flash for
details on Command and Address loading):
1. Step A: Load Command “0000 1000”.
2. Step B: Load Address Low byte, (0x00 - 0x03).
3. Set OE to “0”, and BS1 to “1”. The Calibration byte can now be read at DATA.
4. Set OE to “1”.
29.7.14 Parallel Programming Characteristics
Figure 29-6. Parallel Programming Timing, Including some General Timing Requirements
Data & Contol
(DATA, XA0/1, BS1, BS2)
XTAL1
t
XHXL
t
WLWH
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
Figure 29-7. Parallel Programming Timing, Loading Sequence with Timing Requirements
(1)
XTAL1
PAGEL
t
PLXH
XLXH
t
t
XLPH
ADDR0 (Low Byte) DATA (Low Byte) DATA (High Byte) ADDR1 (Low Byte)
DATA
BS1
XA0
XA1
LOAD ADDRESS
(LOW BYTE)
LOAD DATA
(LOW BYTE)
LOAD DATA
(HIGH BYTE)
LOAD DATA
LOAD ADDRESS
(LOW BYTE)
Note: 1. The timing requirements shown in the first figure in this section (i.e., t
DVXH
, t
XHXL
, and t
XLDX
)
also apply to loading operation.
AVR 8-Bit Microcontroller
MEMPROG- Memory Programming
© 2017 Microchip Technology Inc.
Datasheet Complete
40001974A-page 300