Renesas Hitachi H8S/2191, Hardware Manual, Page: 414 / 1065

Rev. 2.0, 11/00, page 387 of 1037
17.7.3 Competition between Writing and Comparing Match with the OCR
When a comparing match occurs under the T2 state where the OCRA and OCRB are under the
writing cycle, the priority will be given to writing of the OCR and the comparing match signal
will be prohibited.
Figure 17.15 shows the timing chart in this case.
Address OCR address
Internal writing
signal
Comparing match
signal
FRC
Writing data
Will be prohibited
OCR N M
N N+1
T1 T2
Writing cycle with the OCR
Figure 17.15 Competition between Writing and Comparing Match with the OCR