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Contention between TCNT Write and Overflow or Underflow: If an overflow occurs in the T
3
state of a TCNT write cycle, writing takes priority and the counter is not incremented. OVF is
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set to 1.The same holds for underflow. See figure 10-65.
TCNT write cycle
T
T
T
1
2
3
ø
Address bus
TCNT address
Internal write signal
TCNT input clock
Overflow signal
TCNT
H'FFFF
M
TCNT write data
OVF
Figure 10-65 Contention between TCNT Write and Overflow
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