Datasheet

DS1977
14 of 29
Figure 7-4. MEMORY/CONTROL FUNCTION FLOW CHART
Master TX
TA1 (T7:T0), TA2 (T15:T8)
C3h
Verify
Password
N
Y
N
Y
Master TX
Password to verify
DS1977 sets Memory
Address = (T15:T3, 0, 0, 0)
Password
Match?
N
Y
Master Activates
Strong Pullup
Master
TX Reset?
Address of
Password?
Y
N
Master RX
AAh byte
Master RX
FFh byte
N
Y
Master
TX Reset?
From Figure 7
3
rd
Part
To Figure 7
3
rd
Part
CCh
Read
Version
Y
N
Master TX
two bytes 00h
Master RX two copies
of Version Register
NOTE
: The strong
pullup
must be activated within
40µs after the last bit of the
password is transmitted.
Pullup duration: see t
SPUV