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7.6 Application Notes
Application programmers should note that the following types of contention can occur in the 8-bit
timer.
(1) Contention between TCNT Write and Clear: If an internal counter clear signal is generated
during the T
state of a write cycle to the timer counter, the clear signal takes priority and the write
3
is not performed.
Figure 7-11 shows this type of contention.
Internal Address
bus
Internal write
signal
Counter clear
signal
TCNT
Write cycle: CPU writes to TCNT
T
1
Ø
Figure 7-11. TCNT Write-Clear Contention
158
T
T
2
3
TCNT address
N
H'00
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