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10.7.3
Conflict between OCR Write and Compare-Match
If a compare-match occurs during the state after an OCRA or OCRB write cycle, the write takes
priority and the compare-match signal is disabled. Figure 10.19 shows the timing for this type of
conflict.
If automatic addition of OCRAR and OCRAF to OCRA is selected, and a compare-match occurs
in the cycle following the OCRA, OCRAR, and OCRAF write cycle, the OCRA, OCRAR, and
OCRAF write takes priority and the compare-match signal is disabled. Consequently, the result of
the automatic addition is not written to OCRA. Figure 10.20 shows the timing for this type of
conflict.
φ
Address
OCR address
Internal write
signal
Compare-match
signal
FRC
Write data
Disabled
OCR
N
M
N
N + 1
T1
T2
Write cycle of OCR
Figure 10.19 Conflict between OCR Write and Compare-Match
(When Automatic Addition Function is not Used)
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