R01UH0822EJ0100 Rev.1.00
Page 493 of 1041
Jul 31, 2019
RX13T Group
19. Multi-Function Timer Pulse Unit 3 (MTU3c)
19.6.17
Contention between Overflow/Underflow and Counter Clearing
If an overflow/underflow and counter clearing occur simultaneously, a TCIVn interrupt (n = 0 to 4) nor a TCIUn
interrupt (n = 1, 2) is not generated and TCNT clearing takes precedence.
shows the operation timing when a TGR compare match is specified as the clearing source and TGR is
set to FFFFh.
Figure 19.136
Contention between Overflow and Counter Clearing
19.6.18
Contention between TCNT Write Operation and Overflow/Underflow
If TCNT counts up or down in a TCNT write cycle and an overflow or an underflow occurs, the TCNT write operation
takes precedence. A TCIVn interrupt (n = 0 to 4) nor a TCIUn interrupt (n = 1, 2) is not generated.
shows the operation timing when there is contention between TCNT write operation and overflow.
Figure 19.137
Contention between TCNT Write Operation and Overflow
FFFFh
0000h
Disabled
Counter clear signal
TCNT count clock
TCIV interrupt signal
TCNT
PCLKB
TCNT count clock
Written by CPU
FFFFh
M
TCNT write data
TCNT
TCIV interrupt signal
Disabled
PCLKB