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CHAPTER 9 TIMEBASE TIMER
9.1
Overview of Timebase Timer
The timebase timer, which is an 18-bit free-running counter (timebase timer counter)
that counts up in synchronization with the internal count clock (the source clock
frequency divided by 2), has the interval timer function to enable selection for four
types of interval times. Furthermore, it also has functions to supply operation clocks
including timer output for the oscillation stabilization wait time as well as the
watchdog timer.
■
Interval timer function
The interval timer function generates repetitive interval interrupt requests.
•
An interrupt request is generated when the bit for the interval timer in the timebase counter
overflows.
•
The bit for the interval timer (interval time) can be selected out of four types.
Table 9.1-1 shows the interval time of the timebase timer.
Table 9.1-1 Interval time of timebase timer
Internal count clock cycle
HCLK: Oscillation clock
The value during operation of the oscillation clock at 4 MHz is shown in ( ).
186
2 / HCLK (0.5 μs)
Interval cycle
12
2
/ HCLK (approximately 1.0 ms)
14
2
/ HCLK (approximately 4.1 ms)
16
2
/ HCLK (approximately 16.4 ms)
19
2
/ HCLK (approximately 131.1 ms)
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