Table of Contents
Advertisement
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.
■ 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.
0 : Set "0"
1 : Set "1"
• 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.
212
Figure 10.5-1 Setting of the Time-base Timer
bit
15
14
TBTC
RESV
-
1
: Used
13
12
11
10
-
TBIE TBOF TBR TBC1 TBC0
0
0
9
8
7
0
WDTC
Advertisement
Table of Contents
