at90ls4433 ATMEL Corporation, at90ls4433 Datasheet - Page 92

• Manufacturer Part Number: at90ls4433
• Description: At90s4433 8-bit Avr Microcontroller With 4k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

Reading the Signature Bytes
Parallel Programming
Characteristics
92
AT90S/LS4433
The algorithm for reading the signature bytes is as follows (refer to “Programming the
Flash” for details on command and address loading):
A: Load Command “0000 1000”.
B: Load Address Low Byte ($00 - $02).
1. Set OE to “0”, and BS to “0”. The selected signature byte can now be read at
2. Set OE to “1”.
Figure 65. Parallel Programming Timing
Table 33. Parallel Programming Characteristics T
Notes:
Symbol
V
I
t
t
t
t
t
t
t
t
t
t
t
t
t
t
PP
DVXH
XHXL
XLDX
XLWL
BVWL
RHBX
WLWH
WHRL
WLRH
XLOL
OLDV
OHDZ
WLWH_CE
WLWH_PFB
(DATA, XA0/1, BS)
PP
DATA.
Data & Contol
1. Use t
2. If t
RDY/BSY
XTAL1
DATA
Parameter
Programming Enable Voltage
Programming Enable Current
Data and Control Setup before XTAL1 High
XTAL1 Pulse Width High
Data and Control Hold after XTAL1 Low
XTAL1 Low to WR Low
BS Valid to WR Low
BS Hold after RDY/BSY High
WR Pulse Width Low
WR High to RDY/BSY Low
WR Low to RDY/BSY High
XTAL1 Low to OE Low
OE Low to DATA Valid
OE High to DATA Tri-stated
WR Pulse Width Low for Chip Erase
WR Pulse Width Low for Programming the Fuse
Bits
WLWH
WR
OE
WLWH_CE
is held longer than t
t
DVXH
for Chip Erase and t
t
XHXL
(1)
t
t
t
XLOL
XLDX
XLWL
WLRH
(2)
(2)
, no RDY/BSY pulse will be seen.
t
WLWH_PFB
BVWL
t
WLWH
A
for programming the Fuse bits.
t
OLDV
= 25°C ± 10%, V
t
WHRL
11.5
67.0
67.0
67.0
67.0
67.0
67.0
67.0
67.0
Min
0.5
5.0
1.0
20.0
20.0
10.0
Typ
0.7
1.5
CC
t
t
WLRH
OHDZ
t
= 5V ± 10%
RHBX
250.0
1042H–AVR–04/03
12.5
20.0
Max
15.0
0.9
1.8
Units
ms
ms
ms
µA
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
V