R01UH0822EJ0100 Rev.1.00
Page 492 of 1041
Jul 31, 2019
RX13T Group
19. Multi-Function Timer Pulse Unit 3 (MTU3c)
19.6.16
Overflow in Reset-Synchronized PWM Mode
After reset-synchronized PWM mode is selected, MTU3.TCNT and MTU4.TCNT start counting when the CST3 bit of
TSTRA is set to 1. In this state, the MTU4.TCNT count clock source and count edge are determined by the MTU3.TCR
setting.
In reset-synchronized PWM mode, with period register MTU3.TGRA set to FFFFh and the MTU3.TGRA compare
match selected as the counter clearing source, MTU3.TCNT and MTU4.TCNT count up to FFFFh, then a compare
match occurs with MTU3.TGRA, and MTU3.TCNT and MTU4.TCNT are both cleared. In this case, a TCIVn interrupt
(n = 3, 4) is not generated.
shows an example of operation in reset-synchronized PWM mode with period register MTU3.TGRA set
to FFFFh and the MTU3.TGRA compare match specified for the counter clearing source.
Figure 19.135
Overflow in Reset-Synchronized PWM Mode
MTU3.TGRA
(FFFFh)
0000h
Counter cleared by MTU3.TGRA compare match
Not set
Not set
MTU3.TCNT =
MTU4.TCNT
TCIV3 interrupt signal
TCIV4 interrupt signal