Rev. 1.00, 09/03, page 362 of 704
Counter
clear signal
TCNT input
clock
φ
TCNT
TGF
Disabled
TCFV
H'FFFF
H'0000
Figure 12.54 Contention between Overflow and Counter Clearing
Contention 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 priority and the TCFV/TCFU flag in TSR is not
set. Figure 12.55 shows the operation timing when there is contention between TCNT write and
overflow.
Write signal
Address
φ
TCNT address
TCNT
TCNT write cycle
T
1
T
2
H'FFFF
M
TCNT write data
TCFV flag
Figure 12.55 Contention between TCNT Write and Overflow
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