RL78/G15 CHAPTER 6 TIMER ARRAY UNIT
R01UH0959EJ0110 Rev.1.10 Page 207 of 765
Mar 7, 2023
6.5.2 Start timing of counter
Timer count register mn (TCRmn) becomes enabled to operation by setting of TSmn bit of timer channel start register m
(TSm).
Operations from count operation enabled state to timer count register mn (TCRmn) count start is shown in Table 6-6.
Table 6-6. Operations from Count Operation Enabled State to Timer count Register mn (TCRmn) Count Start
Timer operation mode Operation when TSmn = 1 is set
Interval timer mode No operation is carried out from start trigger detection (TSmn=1) until count clock generation.
The first count clock loads the value of the TDRmn register to the TCRmn register and the
subsequent count clock performs count down operation (see 6.5.3(1) Operation of interval
timer mode).
Event counter mode Writing 1 to the TSmn bit loads the value of the TDRmn register to the TCRmn register.
If detect edge of TImn input. The subsequent count clock performs count down operation (see
6.5.3(2) Operation of event counter mode).
Capture mode No operation is carried out from start trigger detection (TSmn=1) until count clock generation.
The first count clock loads 0000H to the TCRmn register and the subsequent count clock performs
count up operation (see 6.5.3(3) Operation of capture mode (input pulse interval
measurement)).
One-count mode
The waiting-for-start-trigger state is entered by writing 1 to the TSmn bit while the timer is stopped
(TEmn = 0).
No operation is carried out from start trigger detection until count clock generation.
The first count clock loads the value of the TDRmn register to the TCRmn register and the
subsequent count clock performs count down operation (see 6.5.3(4) One-count mode
operation).
Capture & one-count mode
The waiting-for-start-trigger state is entered by writing 1 to the TSmn bit while the timer is stopped
(TEmn = 0).
No operation is carried out from start trigger detection until count clock generation.
The first count clock loads 0000H to the TCRmn register and the subsequent count clock performs
count up operation (see 6.5.3(5) Operation of capture & one-count mode (high-level width
measurement)).
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