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CHAPTER 9 TIME-BASE TIMER
9.1 Overview of Time-base Timer
9.1
Overview of Time-base Timer
The time-base timer has a interval timer function that enables a selection of four interval
times using 18-bit free-run counter (time-base counter) count-up with synchronizing to
the internal count clock (2 division of original oscillation). Furthermore, the function of
timer output of oscillation stabilization wait time or function supplying operation clocks
for watchdog timer are provided.
■ Interval Timer Function
The interval timer function generates interrupt requests at regular intervals.
• An overflow of the bit for the interval timer in the time-base counter generates an interrupt request.
• You can select one of four bits (interval time) for the interval timer.
Table 9.1-1 shows the interval time of the time-base timer.
Table 9.1-1 Interval Time of Time-base Timer
Internal count clock cycle
HCLK: Oscillation clock
The value in parentheses is applicable when the oscillation clock operates at 6 MHz.
170
2/HCLK (0.33 μs)
FUJITSU MICROELECTRONICS LIMITED
Time of interval
12
2
/HCLK (Approx. 0.68 ms)
14
2
/HCLK (Approx. 2.7 ms)
16
2
/HCLK (Approx. 10.9 ms)
19
2
/HCLK (Approx. 87.4 ms)
MB90335 Series
CM44-10137-6E
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