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10.4 Interrupts
During interval timer operation, an overflow generates an interval timer interrupt (WOVI). The
interval timer interrupt is requested whenever the OVF bit is set to 1 in TCSR.
10.5 Usage Notes
Contention between TCNT Write and Increment: If a timer counter clock pulse is generated
during the T
state of a write cycle to TCNT, the write takes priority and the timer count is not
3
incremented. See figure 10-8.
ø
TCNT
Internal write
signal
TCNT input
clock
TCNT
Figure 10-8 Contention between TCNT Write and Increment
Changing CKS2 to CKS0 Values: Halt TCNT by clearing the TME bit to 0 in TCSR before
changing the values of bits CKS2 to CKS0.
Write cycle: CPU writes to TCNT
T
T
T
1
2
3
N
309
M
Counter write data
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