HD64F3642AHV Datasheet, PDF (276/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 Timers
Write Access: Write access to the upper byte results in transfer of the upper-byte write data to
TEMP. Next, write access to the lower byte results in transfer of the data in TEMP to the upper
register byte, and direct transfer of the lower-byte write data to the lower register byte.
Figure 9.18 shows an example of the writing of H'AA55 to FRC.
Write to upper byte
CPU
(H'AA)
Bus
interface
Module data bus
TEMP
(H'AA)
Write to lower byte
CPU
(H'55)
Bus
interface
FRCH
()
FRCL
()
Module data bus
TEMP
(H'AA)
FRCH
(H'AA)
FRCL
(H'55)
Figure 9.18 Write Access to FRC (CPU → FRC)
Rev. 6.00 Sep 12, 2006 page 254 of 526
REJ09B0326-0600