313
9.7
Usage Notes
Note that the following kinds of contention can occur in 8-bit timer operation.
9.7.1
Contention between 8TCNT Write and Clear
If a timer counter clear signal occurs in the T
3
state of a 8TCNT write cycle, clearing of the
counter takes priority and the write is not performed. Figure 9.18 shows the timing in this case.
φ
Address bus
8TCNT address
Internal write signal
Counter clear signal
8TCNT
N
H'00
T
1
T
3
T
2
8TCNT write cycle
Figure 9.18 Contention between 8TCNT Write and Clear
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