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DS1996
MEMORY FUNCTION EXAMPLES
Example: Write two data bytes to memory locations 0026h and 0027h (the seventh and 8th bytes of page
1). Read entire memory.
MASTER MODE
TX
RX
TX
TX
TX
TX
TX
TX
RX
TX
TX
RX
RX
RX
RX
TX
RX
TX
TX
TX
TX
TX
TX
RX
TX
TX
TX
TX
RX
TX
RX
DATA (LSB FIRST)
Reset
Presence
CCh
0Fh
26h
00h
<2 data bytes>
Reset
Presence
CCh
AAh
26h
00h
07h
<2 data bytes>
Reset
Presence
CCh
55h
26h
00h
07h
Reset
Presence
CCh
F0h
00h
00h
<8192 bytes>
Reset
Presence
8 of 19
COMMENTS
Reset pulse (480-960 μs)
Presence pulse
Issue “skip ROM” command
Issue “write scratchpad” command
TA1, beginning offset=6
TA2, address=0026h
Write 2 bytes of data to scratchpad
Reset pulse
Presence pulse
Issue “skip ROM” command
Issue “read scratchpad” command
Read TA1, beginning offset=6
Read TA2, address=0026h
Read E/S, ending offset=7, flags=0
Read scratchpad data and verify
Reset pulse
Presence pulse
Issue “skip ROM” command
Issue “copy scratchpad” command
TA1
TA2 AUTHORIZATION CODE
E/S
Reset pulse
Presence pulse
Issue “skip ROM” command
Issue “read memory” command
TA1, beginning offset=0
TA2, address=0000h
Read entire memory
Reset pulse
Presence pulse, done
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