Rev. 5.00, 12/03, page 400 of 1088
10.6
Usage Notes
Note that the following kinds of contention can occur in the 8-bit timer module.
10.6.1
Contention between TCNT Write and Clear
If a timer counter clock pulse is generated during the T
2
state of a TCNT write cycle, the clear
takes priority, so that the counter is cleared and the write is not performed.
Figure 10-10 shows this operation.
φ
Address
TCNT address
Internal write signal
Counter clear signal
TCNT
N
H'00
T
1
T
2
TCNT write cycle by CPU
Figure 10-10 Contention between TCNT Write and Clear
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