Rev. 1.00, 09/03, page 358 of 704
Contention between TCNT Write and Clear Operations:
If the counter clear signal is generated in the T2 state of a TCNT write cycle, TCNT clearing takes
priority and the TCNT write is not performed. Figure 12.47 shows the timing in this case.
Counter clear
signal
Write signal
Address
φ
TCNT address
TCNT
TCNT write cycle
T
1
T
2
N
H'0000
Figure 12.47 Contention between TCNT Write and Clear Operations
Contention between TCNT Write and Increment Operations:
If incrementing occurs in the T2 state of a TCNT write cycle, the TCNT write takes priority and
TCNT is not incremented. Figure 12.48 shows the timing in this case.
TCNT input
clock
Write signal
Address
φ
TCNT address
TCNT
TCNT write cycle
T
1
T
2
N
M
TCNT write data
Figure 12.48 Contention between TCNT Write and Increment Operations
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