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DS1992 Datasheet(PDF) 7 Page - Dallas Semiconductor

Part # DS1992
Description  1kbit/4kbit Memory iButtonTM DS1994 4-kbit Plus Time Memory iButtonTM
PDF  17 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1992 Datasheet(HTML) 7 Page - Dallas Semiconductor

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DS1992/DS1993
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Figure 6. MEMORY FUNCTIONS FLOW CHART
Master TX Memory
Function Command
Y
DS199X sets Scratchpad
Offset = (T4:T0) and
Clears (PF, OF, AA)
DS199X sets (E4:E0)
= Scratchpad Offset
DS199X Increments
Scratchpad Offset
Bus Master TX
TA1 (T7:T0)
Bus Master TX
TA2 (T15:T8)
Master TX Data Byte
To Scratchpad Offset
Bus Master
TX Reset
?
N
0FH
Write
?
Scratchpad
N
Bus Master
TX Data
?
Y
N
PF = 1
N
Y
Bus Master
TX Reset
?
To Figure 6
Second Part
Bus Master RX
TA1 (T7:T0)
Bus Master RX
TA2 (T15:T8)
Master RX Ending
Offset with Data
Status (E/S)
DS199X Sets
Scratchpad
Offset=(T4:T0)
Bus Master
TX Reset
?
DS199X Increments
Scratchpad Offset
Y
Master RX Data
Byte From
Scratchpad Offset
N
N
Scratch-
pad Offset =
11111b ?
Y
Y
Scratchpad
AAH
Read
?
Bus Master
RX "1"s
From Figure 6
Second Part
OF = 1
Scratch-
pad Offset =
11111b ?
N
Partial
Byte Written
?
N
Y
Y
Y
DS199X TX
Presence Pulse
(See Figure 9)



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