Renesas RX600 Series, User Manual

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RX610 Group 18. Compare Match Timer (CMT)
R01UH0032EJ0120 Rev.1.20 Page 595 of 1006
Feb 20, 2013
18.5 Usage Notes
18.5.1 Setting the Module Stop Function
The CMT can be enabled or disabled using the module stop control register. The CMT is disabled by default. The
registers can be accessed by canceling the module stop state. For details, see section 8, Low Power Consumption.
18.5.2 Conflict between Write and Compare-Match Processes of CMCNT
When the compare match signal is generated while writing to CMCNT, clearing CMCNT has priority over writing to it.
In this case, CMCNT is not written to. Figure 18.5 shows the timing to clear the CMCNT counter.
0000h N
Write to CMCNT
CMCNT
Compare match signal
Internal write signal
PCLK
Figure 18.5 Conflict between Write and Compare Match Processes of CMCNT
18.5.3 Conflict between Write and Count-Up Processes of CMCNT
Even when the count-up occurs while writing to CMCNT, the writing has priority over the count-up. In this case, the
count-up is not performed. Figure 18.6 shows the timing to write the CMCNT counter.
CMCNT write data
Write to CMCNT
PCLK
Internal write signal
CMCNT input clock
CMCNT
M N
Figure 18.6 Conflict between Write and Count-Up Processes of CMCNT