DS1921 DALLAS [Dallas Semiconductor], DS1921 Datasheet - Page 18

• Manufacturer Part Number: DS1921
• Description: High-Resolution Thermochron iButton
• Manufacturer: DALLAS [Dallas Semiconductor]

MEMORY/CONTROL FUNCTION FLOW CHART Figure 10-1
ments Scratch-
DS1921 Incre-
pad Offset
N
Y
Y
TA1 (T7:T0), TA2 (T15:T8)
Command, Address, Data
Master TX Memory or
Control Fkt. Command
DS1921 sets Scratch-
Master TX Data Byte
DS1921 sets (E4:E0)
to Scratchpad Offset
pad Offset = (T4:T0)
Master RX CRC16 of
and Clears (PF, AA)
= Scratchpad Offset
Master RX "1"s
DS1921 sets
pad Offset =
Scratchpad
EMCLR = 0
TX Reset?
TX Reset?
TX Reset?
Master TX
11111b?
Scratch-
Master
Master
Master
Write
0FH
N
Y
N
N
Y
Byte Written?
Y
N
Partial
Flow Chart (Figure 12)
N
To ROM Functions
18 of 44
Flow Chart (Figure 12)
From ROM Functions
PF = 1
Y
ments Scratch-
DS1921 Incre-
pad Offset
N
Y
E/S Byte, and Data Starting
TA1 (T7:T0), TA2 (T15:T8)
Command, Address Data,
from Scratchpad Offset
DS1921 sets Scratch-
Master RX Data Byte
at the Target Address
pad Offset = (T4:T0)
Master RX CRC16 of
Master RX Ending
Offset with Data
Master RX "1"s
DS1921 sets
pad Offset =
Status (E/S)
Scratchpad
EMCLR = 0
TX Reset?
TX Reset?
Master RX
11111b?
Scratch-
Master
Master
Read
AAH
N
Y
N
Y
From Figure 10
To Figure 10
N
2
2
Y
nd
nd
Part
Part
DS1921H/Z