Fujitsu MB90460 Series, Hardware Manual, Page: 231 / 739

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CHAPTER 10 TIME-BASE TIMER
10.5 Operation of the Time-base Timer
The time-base timer provides the interval timer function and the clock supply function
that supplies clocks to some peripheral functions.
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Operation of the Interval Timer Function (Time-base Timer)
The interval timer function generates an interrupt request for each interval
The setting in Figure 10.5-1 is required to all the timer to operate as an interval timer.
Figure 10.5-1 Setting of the Time-base Timer
• The time-base timer counter continues counting up in synchronization with the internal count clock
(one-half of the oscillation clock) as long as the clock is being oscillated.
• When the counter is cleared (TBR = 0), it counts up from "0". When the interval timer bit overflows,
the interrupt request flag bit (TBOF) is set to "1". If interrupt request output has been enabled (TBIE =
1), an interrupt is generated for each selected interval based on the cleared time.
• The interval may become longer than the time set because of time-base timer clearing.
RESV - - TBIE TBOF TBR TBC1 TBC0
TBTC
15 14 13 12 11 10 9 8
WDTC
7 0
1
: Used
0 : Set "0"
1 : Set "1"
0
0
bit