X5001
Table 1. Instruction Set Definition
Instruction Format
0000 0110
0000 0100
0000 0001
Instruction Name and Operation
EWDC: Enable Watchdog Change Operation
DWDC: Disable Watchdog Change Operation
SWDT: Set Watchdog Timer control bits:
Instruction followed by contents of register: 000(WD
1
) (WD
0
)000
See Watchdog Timer Settings and Figure 3.
RWDT: Read Watchdog Timer control bits
0000 0101
Notes:
Instructions are shown with MSB in leftmost position. Instructions are transferred MSB first.
7038 FRM T03
Figure 1. Read Watchdog Timer setting
CS
0
SCK
1
2
3
4
5
6
7
...
...
W
D
1
W
D
0
RWDT
INSTRUCTION
SI
SO
...
Figure 2. Enable Watchdog Change/Disable Watchdog Change Sequence
CS
0
SCK
1
2
3
4
5
6
7
INSTRUCTION
(1 BYTE)
SI
SO
HIGH IMPEDANCE
7
XICOR [ XICOR INC. ]
