Rainbow Electronics DS1972 - Manual (Page 11)

DS1972: 1024-Bit EEPROM iButton
11 of 23
Figure 7-3. Memory Function Flow Chart (continued)
* 1-Wire idle high for power
From Figure 7
2 nd Part
To Figure 7
2 nd Part
To Figure 7
4 th Part
From Figure 7
4 th Part
55h
Copy Scratch-
Pad ?
Bus Master TX
TA1 (T7:T0), TA2 (T15:T8)
and E/S Byte
Y
N
Bus Master
RX “1”s
Master
TX Reset ?
Y
N
Y
Auth. Code
Match ?
N
N
Copy-
Protected ?
Y
DS1972 copies Scratch-
pad Data to Address
AA = 1
*
DS1972 TX “0”
Master
TX Reset ?
Master
TX Reset ?
Y
N
DS1972 TX “1”
N
Y
Applicable to all R/W
memory locations.
Y
T15:T0
< 0090h ?
N
PF = 0 ?
Y
N
Duration: t
PROG