Rainbow-electronics DS2422 Manual do Utilizador Página 28

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DS2422
28 of 48
Figure 12-1. Memory/Control Function Flow Chart
Master TX Memory or
Control Fkt. Command
0FH
Write
Scratch
ad
Master TX
TA1
(
T7:T0
)
Master TX
TA2
(
T15:T8
)
DS2422 sets Scratch-
pad Offset = (T4:T0)
and Clears
(
PF, AA
)
Master TX Data Byte
to Scratch
p
ad Offset
DS2422 sets (E4:E0)
= Scratch
p
ad Offset
Master
TX Reset?
Scratch-
pad Offset =
11111b?
Master RX CRC16 of
Command, Address Data
DS2422 Incre-
ments Scratch-
p
ad Offset
Master RX "1"s
Master
TX Reset?
Master
TX Reset?
Partial
Byte Written?
PF = 1
AAH
Read
Scratch
ad
Master RX
TA1
(
T7:T0
)
Master RX
TA2
(
T15:T8
)
Master RX Ending
Offset with Data
Status
(
E/S
)
Master
TX Reset?
Scratch-
pad Offset =
11111b?
Master RX CRC16 of
Command, Address Data,
E/S Byte, and Data Starting
at the Target Address
DS2422 Incre-
ments Scratch-
p
ad Offset
Master RX "1"s
Master
TX Reset?
DS2422 sets Scratch-
p
ad Offset =
(
T4:T0
)
Master RX Data Byte
from Scratch
p
ad Offset
From ROM Functions
Flow Chart
(
Fi
g
ure 14
)
To ROM Functions
Flow Chart
(
Fi
g
ure 14
)
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
From Figure 12
2
nd
Part
To Figure 12
2
nd
Part
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