Renesas H8S/2368 Series Hardware Manual page 550

Bit Bit Name
6 WT/IT
5 TME
4 —
3 —
2 CKS2
1 CKS1
0 CKS0
Note: * Only a write of 0 is permitted, to clear the flag.
Rev. 2.00, 05/03, page 498 of 820
Initial Value R/W
0 R/W
0 R/W
1 —
1 —
0 R/W
0 R/W
0 R/W
Description
Timer Mode Select
Selects whether the WDT is used as a watchdog
timer or interval timer.
0: Interval timer mode
When TCNT overflows, an interval timer
interrupt (WOVI) is requested.
1: Watchdog timer mode
When TCNT overflows, the WDTOVF signal is
output.
Timer Enable
When this bit is set to 1, TCNT starts counting.
When this bit is cleared, TCNT stops counting and
is initialized to H'00.
Reserved
These bits are always read as 1 and cannot be
modified.
Clock Select 2 to 0
Selects the clock source to be input to TCNT. The
overflow frequency for φ = 20 MHz is enclosed in
parentheses.
000: Clock φ/2 (frequency: 25.6 µs)
001: Clock φ/64 (frequency: 819.2 µs)
010: Clock φ/128 (frequency: 1.6 ms)
011: Clock φ/512 (frequency: 6.6 ms)
100: Clock φ/2048 (frequency: 26.2 ms)
101: Clock φ/8192 (frequency: 104.9 ms)
110: Clock φ/32768 (frequency: 419.4 ms)
111: Clock φ/131072 (frequency: 1.68 s)