Changing Value Of Cks2 To Cks0; Switching Between Watchdog Timer Mode And Interval Timer Mode - Hitachi H8S/2338 Series Hardware Manual

ø
Address
Internal write signal
TCNT input clock
TCNT
Figure 10-8 Contention between TCNT Write and Increment
10.5.2

Changing Value of CKS2 to CKS0

If bits CKS2 to CKS0 in TCSR are written to while the WDT is operating, errors may occur in the
incrementation. Software must stop the watchdog timer (by clearing the TME bit to 0) before
changing the value of bits CKS2 to CKS0.
10.5.3

Switching between Watchdog Timer Mode and Interval Timer Mode

If the mode is switched from watchdog timer to interval timer, or vice versa, while the WDT is
operating, errors may occur in the incrementation. Software must stop the watchdog timer (by
clearing the TME bit to 0) before switching the mode.
TCNT write cycle
T T
1 2
N M
Counter write data
383