Parallel Programming Characteristics - Atmel AVR AT90S4434 Preliminary

Parallel Programming Characteristics

Figure 70. Parallel Programming Timing
Data & Contol
(DATA, XA0/1, BS)
Table 41. Parallel Programming Characteristics, T
Symbol Parameter
V Programming Enable Voltage
PP
I Programming Enable Current
PP
t Data and Control Setup before XTAL1 High
DVXH
t XTAL1 Pulse Width High
XHXL
t Data and Control Hold after XTAL1 Low
XLDX
t XTAL1 Low to WR Low
XLWL
t BS Valid to WR Low
BVWL
t BS Hold after RDY/BSY High
RHBX
t WR Pulse Width Low
WLWH
t WR High to RDY/BSY Low
WHRL
t WR Low to RDY/BSY High
WLRH
t XTAL1 Low to OE Low
XLOL
t OE Low to DATA Valid
OLDV
t OE High to DATA Tri-stated
OHDZ
t WR Pulse Width Low for Chip Erase
WLWH_CE
WR Pulse Width Low for Programming the Fuse
t Bits
WLWH_PFB
Notes: 1. Use t for Chip Erase and t
WLWH_CE
2. If t is held longer than t
WLWH
AT90S/LS4434 and AT90S/LS8535
92
t
XTAL1
XHXL
t
DVXH
WR
RDY/BSY
OE
DATA
A
(1)
(2)
(2)
for programming the Fuse bits.
WLWH_PFB
, no RDY/BSY pulse will be seen.
WLRH
t
XLWL
t t
XLDX BVWL
t
WLWH
t
WHRL
t
XLOL
t
OLDV
= 25 ° C ± 10%, V
= 5V ± 10%
CC
Min
11.5
67.0
67.0
67.0
67.0
67.0
67.0
67.0
0.5
67.0
5.0
1.0
t
RHBX
t
WLRH
t
OHDZ
Typ Max
12.5
250.0
20.0
0.7 0.9
20.0
20.0
10.0 15.0
1.5 1.8
Units
V
µA
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
ns
ns
ms
ms