Rainbow Electronics DS1972 - Manual (Page 10)

DS1972: 1024-Bit EEPROM iButton
10 of 23
Figure 7-2. Memory Function Flow Chart (continued)
AAh
Read Scratch-
Pad ?
DS1972 sets Scratchpad
Byte Counter = T2:T0
Bus Master RX
TA1 (T7:T0), TA2 (T15:T8)
and E/S Byte
Bus Master RX
Data Byte from Scratchpad
Bus Master RX CRC16
of Command, Address,
E/S Byte, Data Bytes as
sent by the DS1972
Y
Master
TX Reset ?
Y
Bus Master
RX “1”s
N
Master
TX Reset ?
DS1972
Increments
Byte Counter
Byte Counter
= E2:E0 ?
Y
Y
N
N
N
From Figure 7
1 st Part
To Figure 7
1 st Part
To Figure 7
3 rd Part
From Figure 7
3 rd Part