Epson S1C17W22 Technical Manual page 95

8 WATCHDOG TIMER (WDT)
Bits 3–0 WDTRUN[3:0]
These bits control WDT to run and stop.
0xa (WP):
Values other than 0xa (WP): Run
0xa (R):
0x0 (R):
Always 0x0 is read if a value other than 0xa is written.
Since a reset may be generated immediately after running depending on the counter value, WDT
should also be reset concurrently when running WDT.
8-4
Stop
Idle
Running
Seiko Epson Corporation
S1C17W22/W23 TECHNICAL MANUAL
(Rev. 1.3)