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
set to 1.The same holds for underflow. See figure 10-65.
Figure 10-65 Contention between TCNT Write and Overflow
ø
Address bus
Internal write signal
TCNT input clock
Overflow signal
TCNT
OVF
H'FFFF
TCNT address
M
TCNT write data
TCNT write cycle
T
1
T
2
T
3
384
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