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Contention between TCNT Write and Overflow or Underflow: If an overflow occurs in the T
state of a TCNT write cycle, writing takes priority and the counter is not incremented. OVF is set
to 1.The same holds for underflow. See figure 8-65.
ø
Address
Internal write signal
TCNT input clock
Overflow signal
TCNT
OVF
Figure 8-65 Contention between TCNT Write and Overflow
270
TCNT write cycle
T
T
1
2
TCNT address
H'FFFF
TCNT write data
T
3
M
3
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