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12.2
Register Descriptions
The WDT has the following three registers. For details, refer to section 23, List of 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 12.5.1, Notes on Register Access.
• Timer counter (TCNT)
• Timer control/status register (TCSR)
• Reset control/status register (RSTCSR)
12.2.1
Timer Counter (TCNT)
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.
12.2.2
Timer Control/Status Register (TCSR)
TCSR is an 8-bit readable/writable register. Its functions include selecting the clock source to be
input to TCNT, and selecting the timer mode.
Rev. 3.0, 10/02, page 348 of 686
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