R01UH0823EJ0100 Rev.1.00
Page 604 of 1823
Jul 31, 2019
RX23W Group
23. Multi-Function Timer Pulse Unit 2 (MTU2a)
23.6.16
Overflow Flags in Reset-Synchronized PWM Mode
After reset-synchronized PWM mode is selected, counters MTU3.TCNT and MTU4.TCNT start counting when the
TSTR.CST3 bit is set to 1. In this state, the MTU4.TCNT count clock source and count edge are determined by the
MTU3.TCR register setting.
In reset-synchronized PWM mode, with cycle register MTU3.TGRA set to FFFFh and the MTU3.TGRA compare match
selected as the counter clearing source, counters MTU3.TCNT and MTU4.TCNT count up to FFFFh, then a compare
match occurs with the MTU3.TGRA register, and counters MTU3.TCNT and MTU4.TCNT are both cleared. In this
case, the corresponding TCIV interrupt request is not generated.
shows an operation example in reset-synchronized PWM mode with cycle register MTU3.TGRA set to
FFFFh and the MTU3.TGRA compare match specified for the counter clearing source.
Figure 23.108
Overflow Flags in Reset-Synchronized PWM Mode
MTU3.TGRA
(FFFFh)
0000h
TCIV3 interrupt signal
TCIV4 interrupt signal
Counter cleared by MTU3.TGRA
Not generated
Not generated
MTU3.TCNT =
MTU4.TCNT