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9.2.5
Application Note
When bit 0 (TACKSTP) of the clock stop register 1 (CKSTPR1) is cleared to 0, bit 3 (TMA3) of
the timer mode register A (TMA) cannot be rewritten.
Set bit 0 (TACKSTP) of the clock stop register 1 (CKSTPR1) to 1 before rewriting bit 3 (TMA3)
of the timer mode register A (TMA).
9.3
Timer C
9.3.1
Overview
Timer C is an 8-bit timer that increments or decrements each time a clock pulse is input. This
timer has two operation modes, interval and auto reload.
Features
Features of timer C are given below.
•
Choice of seven internal clock sources (
φ
/8192,
φ
/2048,
φ
/512,
φ
/64,
φ
/16,
φ
/4,
φ
W
/4) or an
external clock (can be used to count external events).
•
An interrupt is requested when the counter overflows.
•
Up/down-counter switching is possible by hardware or software.
•
Subactive mode or subsleep mode operation is possible when
φ
W
/4 is selected as the internal
clock, or when an external clock is selected.
•
Use of module standby mode enables this module to be placed in standby mode independently
when not used.
Содержание H8/38024 Series
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