h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 354

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 11 16-Bit Free-Running Timer
Contention 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 inhibited.
Figure 11.20 shows this type of contention.
If automatic addition of OCRAR/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 inhibited. Consequently, the result of
the automatic addition is not written to OCRA.
Figure 11.21 shows this type of contention.
Rev. 4.00 Jun 06, 2006 page 300 of 1004
REJ09B0301-0400
Figure 11.20 Contention between OCR Write and Compare-Match
Address
Internal write signal
FRC
OCR
Compare-match
signal
(When Automatic Addition Function Is Not Used)
OCRA or OCRB write cycle
T
OCR address
1
N
N
T
2
Write data
M
Inhibited
N + 1