Parallel programming characteristics, Serial downloading, Table 40 – Rainbow Electronics AT90LS8535 User Manual
Page 99
99
AT90S/LS8535
1041H–11/01
Parallel Programming
Characteristics
Figure 70. Parallel Programming Timing
Notes:
1. Use t
WLWH_CE
for Chip Erase and t
WLWH_PFB
for programming the Fuse bits.
2. If t
WLWH
is held longer than t
WLRH
, no RDY/BSY pulse will be seen.
Serial Downloading
Both the Flash and EEPROM memory arrays can be programmed using the serial SPI
bus while RESET is pulled to GND. The serial interface consists of pins SCK, MOSI
(input) and MISO (output), see Figure 71. After RESET is set low, the Programming
Enable instruction needs to be executed first before program/erase operations can be
executed.
Table 40. Parallel Programming Characteristics, T
A
= 25
°C ± 10%, V
CC
= 5V ± 10%
Symbol
Parameter
Min
Typ
Max
Units
V
PP
Programming Enable Voltage
11.5
12.5
V
I
PP
Programming Enable Current
250.0
µA
t
DVXH
Data and Control Setup before XTAL1 High
67.0
ns
t
XHXL
XTAL1 Pulse Width High
67.0
ns
t
XLDX
Data and Control Hold after XTAL1 Low
67.0
ns
t
XLWL
XTAL1 Low to WR Low
67.0
ns
t
BVWL
BS Valid to WR Low
67.0
ns
t
RHBX
BS Hold after RDY/BSY High
67.0
ns
t
WLWH
WR Pulse Width Low
67.0
ns
t
WHRL
WR High to RDY/BSY Low
20.0
ns
t
WLRH
WR Low to RDY/BSY High
0.5
0.7
0.9
ms
t
XLOL
XTAL1 Low to OE Low
67.0
ns
t
OLDV
OE Low to DATA Valid
20.0
ns
t
OHDZ
OE High to DATA Tri-stated
20.0
ns
t
WLWH_CE
WR Pulse Width Low for Chip Erase
5.0
10.0
15.0
ms
t
WLWH_PFB
WR Pulse Width Low for Programming the
Fuse Bits
1.0
1.5
1.8
ms
Data & Contol
(DATA, XA0/1, BS)
DATA
W
rite
Read
XTAL1
t
XHXL
t
WLWH
t
DVXH
t
XLOL
t
OLDV
t
WHRL
t
WLRH
WR
RDY/BSY
OE
t
XLDX
t
XLWL
t
RHBX
t
OHDZ
t
BVWL