Renesas H8S/2111B Manual de usuario Pagina 257

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Rev. 1.00, 05/04, page 223 of 544
11.2 Input/Output Pins
The WDT has the pins listed in table 11.1.
Table 11.1 Pin Configuration
Name Symbol I/O Function
Reset output pin RESO Output Outputs the counter overflow signal in
watchdog timer mode
External sub-clock input pin EXCL Input Inputs the clock pulses to the WDT_1
prescaler counter
11.3 Register Descriptions
The WDT has the following registers. To prevent accidental overwriting, TCSR and TCNT have
to be written to in a method different from normal registers. For details, refer to section 11.6.1,
Notes on Register Access. For details on the system control register, refer to section 3.2.2, System
Control Register (SYSCR).
Timer counter (TCNT)
Timer control/status register (TCSR)
11.3.1 Timer Counter (TCNT)
TCNT is an 8-bit readable/writable up-counter.
TCNT is initialized to H'00 when the TME bit in the timer control/status register (TCSR) is
cleared to 0.
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