HD6473847RHV Datasheet, PDF (285/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 9 Timers
Watchdog
on-chip
oscillator
φ
PSS
TMW
TCSRW
TCW
φ_W/32
Interrupt/reset
controller
Internal reset signal or
interrupt request signal
Legend:
TCSRW: Timer control/status register W
TCW: Timer counter W
TMW: Timer mode register W
PSS: Prescaler S
Figure 9.12(2) Block Diagram of Watchdog Timer (H8/38104 Group)
9.5.2 Register Descriptions
The watchdog timer has the following registers.
• Timer control/status register W (TCSRW)
• Timer counter W (TCW)
• Timer mode register W (TMW)*
Note: * This register is implemented on the H8/38104 Group only.
Timer Control/Status Register W (TCSRW): TCSRW performs the TCSRW and TCW write
control. TCSRW also controls the watchdog timer operation and indicates the operating state.
TCSRW must be rewritten by using the MOV instruction. The bit manipulation instruction cannot
be used to change the setting value.
Rev. 7.00 Mar. 08, 2010 Page 253 of 510
REJ09B0024-0700