X5001 XICOR [Xicor Inc.], X5001 Datasheet - Page 8

• Manufacturer Part Number: X5001
• Description: CPU Supervisor
• Manufacturer: XICOR [Xicor Inc.]

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