DS1977 查看數據表（PDF） - Maxim Integrated
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DS1977 Datasheet PDF : 29 Pages
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Figure 7-1. MEMORY/CONTROL FUNCTION FLOW CHART
Master TX Memory
Function Command
From ROM Functions
Flow Chart (Figure 9)
0Fh
Write
N
Scratchpad
Y
Master TX
TA1 (T7:T0), TA2 (T15:T8)
Address of
Y
Password?
N
DS1977 sets Scratch-
pad Offset = (T5:T0)
and Clears (PF, AA)
DS1977 sets Scratchpad
Offset = (T5:T3,0,0,0) and
Clears (PF, AA, T2:T0)
Master TX Data Byte
to Scratchpad Offset
DS1977 sets (E5:E0)
= Scratchpad Offset
Master TX one or both
8-byte passwords
AAh
Read
N
Scratchpad
Y
Master RX
TA1 (T7:T0)
Master RX
TA2 (T15:T8)
Master RX Ending
Offset with Data
Status (E/S)
DS1977 sets Scratch-
pad Offset = (T5:T0)
Master RX Data Byte
from Scratchpad Offset
DS1977
To Figure 7
2nd Part
DS1977 Incre-
ments Scratch-
pad Offset
N
Y
Master
TX Reset?
N
Scratch-
pad Offset =
3Fh?
Y
Master
TX Reset?
Y
Partial
Byte Written?
N
N
Master RX CRC16 of
Command, Address Data
Y
Master
TX Reset?
N
Master RX "1"s
Master
Y
TX Reset?
DS1977 Incre-
ments Scratch-
pad Offset
N
Y
N
Scratch-
pad Offset =
3Fh?
Y
PF = 1
Master RX CRC16 of
Command, Address Data,
E/S Byte, and Data Starting
at the Target Address
Y
Master
TX Reset?
N
Master RX "1"s
11 of 29
To ROM Functions
Flow Chart (Figure 9)
From Figure 7
2nd Part
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