HD6473847RHV Datasheet, PDF (287/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 9 Timers
Initial
Bit
Bit Name Value R/W Description
0
WRST 0
R/(W)^*1 Watchdog Timer Reset
[Setting condition]
When TCW overflows and an internal reset signal is
generated
[Clearing conditions]
• Reset by RES pin
• When 0 is written to the WRST bit while writing 0 to
the B0WI bit when the TCSRWE bit = 1
Notes: 1. These bits can be written only when the writing conditions are satisfied.
2. Initial value 0 on H8/38004, H8/38002S Group and 1 on H8/38104 Group.
3. On reset, cleared to 0 on H8/38004, H8/38002S Group and set to 1 on H8/38104
Group.
Timer Counter W (TCW): TCW is an 8-bit readable/writable up-counter. When TCW overflows
from H'FF to H'00, the internal reset signal is generated and the WRST bit in TCSRW is set to 1.
TCW is initialized to H'00.
Timer Mode Register W (TMW): TMW selects the input clock. Clock source selection using
this register is enabled when WDCKS in port mode register 2 (PMR2) is cleared to 0. If WDCKS
is set to 1, φw/32 is selected as the clock source, regardless of the setting of TMW.
Note: TMW is implemented on H8/38104 Group only.
Rev. 7.00 Mar. 08, 2010 Page 255 of 510
REJ09B0024-0700