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