h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 336

• Manufacturer Part Number: h8s-2628
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 13 Watchdog Timer
13.2
The WDT has the following three registers. To prevent accidental overwriting, TCSR, TCNT, and
RSTCSR have to be written to by a different method to normal registers. For details, refer to
section 13.5.1, Notes on Register Access.
13.2.1
TCNT is an 8-bit readable/writable up-counter. TCNT is initialized to H'00 by a reset, when the
TME bit in TCSR is cleared to 0.
Rev. 3.00 Oct 04, 2005 page 296 of 598
REJ09B0155-0300
Timer control/status register (TCSR)
Timer counter (TCNT)
Reset control/status register (RSTCSR)
Register Descriptions
Timer Counter (TCNT)
Internal reset signal*
(interrupt request
Legend:
TCSR:
TCNT:
RSTCSR:
Note: * The type of internal reset signal depends on a register setting.
signal)
WOVI
Timer control/status register
Timer counter
Reset control/status register
Figure 13.1 Block Diagram of WDT
RSTCSR
Interrupt
control
control
Reset
Overflow
Module bus
TCNT
Clock
WDT
select
Clock
TSCR
Internal clock
sources
interface
Bus
/2
/64
/128
/512
/2048
/8192
/32768
/131072