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Section 18 Multi-Function Timer Pulse Unit (MTU)
Rev. 4.00 Sep. 14, 2005 Page 639 of 982
REJ09B0023-0400
Counter clear
signal
TCNT
TCNT input
clock
Pφ
H'FFFF H'0000
TGF
TCFV
Disabled
Figure 18.83 Conflict between Overflow and Counter Clearing
18.7.17 Conflict between TCNT Write and Overflow/Underflow
If there is an up-count or down-count in the T2 state of a TCNT write cycle, and
overflow/underflow occurs, the TCNT write takes precedence and the TCFV/TCFU flag in TSR is
not set.
Figure 18.84 shows the operation timing when there is conflict between TCNT write and
overflow.
Write signal
Address
Pφ
TCNT address
TCNT
TCNT write cycle
T1
T2
H'FFFF M
TCNT write data
TCFV flag
Figure 18.84 Conflict between TCNT Write and Overflow