HD64F2145 Datasheet, PDF (373/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

TCNT value
H'FF
Overflow
H'00
Time
WT/ = 1
TME = 1
Write H'00 to
OVF = 1*
TCNT
and internal
reset signals generated
WT/ = 1
TME = 1
Write H'00 to
TCNT
signal
Internal reset signal
132 system clocks
518 system clocks
WT/ : Timer mode select bit
TME : Timer enable bit
OVF : Overflow flag
Note: * After the OVF bit becomes 1, it is cleared to 0 by an internal reset.
The XRST bit is also cleared to 0.
Figure 14.2 Watchdog Timer Mode (RST/10, = 1) Operation
Rev. 2.0, 08/02, page 333 of 788