X5001
Figure 3. Write WatchdogTimer Sequence
CS
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
SCK
INSTRUCTION
DATA BYTE
4
6
5
3
SI
W
D
1
W
D
0
HIGH IMPEDANCE
SO
Figure 4. Read Nonvolatile Status (Option 1) (Used to determine end of Watchdog Timer store operation)
CS
0
1
2
3
4
5
6
7
SCK
SI
RWDT
INSTRUCTION
NONVOLATILE WRITE IN PROGRESS
SO
SO HIGH During 1st bit while
in the Nonvolatile write cycle
Figure 5. Read Nonvolatile Status (Option 2) (Used to determine end of Watchdog Timer store operation)
CS
0
1
2
3
4
5
6
7
SCK
SI
RWDT
INSTRUCTION
NONVOLATILE WRITE IN PROGRESS
SO
SO HIGH During
Nonvolatile write cycle
8
XICOR [ XICOR INC. ]
