Datasheet

Section 12 Watchdog Timer (WDT)
REJ09B0140-0900 Rev. 9.00 Page 371 of 846
Sep 16, 2010
H8S/2215 Group
Bit Bit Name Initial Value R/W Description
6 WT/IT 0 R/W Timer Mode Select
Selects whether the WDT is used as a watchdog
timer or interval timer.
0: Interval timer mode
1: Watchdog timer mode
5 TME 0 R/W 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.
4, 3 — All 1 — Reserved
These bits are always read as 1 and cannot be
modified.
2
1
0
CKS2
CKS1
CKS0
0
0
0
R/W
R/W
R/W
Clock Select 2 to 0
Selects the clock source to be input to TCNT. The
overflow frequency for φ = 16 MHz is enclosed in
parentheses.
000: Clock φ/2 (frequency: 32.0 μs)
001: Clock φ/64 (frequency: 1.0 ms)
010: Clock φ/128 (frequency: 2.0 ms)
011: Clock φ/512 (frequency: 8.2 ms)
100: Clock φ/2048 (frequency: 32.8 ms)
101: Clock φ/8192 (frequency: 131.1 ms)
110: Clock φ/32768 (frequency: 524.3 ms)
111: Clock φ/131072 (frequency: 2.1 s)
Note: * The write value should always be 0 to clear this flag.