HD64F3644PV Datasheet, PDF (277/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 Timers
Read Access: In access to FRC and ICRA to ICRD, when the upper byte is read the upper-byte
data is transferred directly to the CPU and the lower-byte data is transferred to TEMP. Next, when
the lower byte is read, the lower-byte data in TEMP is transferred to the CPU.
In access to OCRA or OCRB, when the upper byte is read the upper-byte data is transferred
directly to the CPU, and when the lower byte is read the lower-byte data is transferred directly to
the CPU.
Figure 9.19 shows an example of the reading of FRC when FRC contains H'AAFF.
Read upper byte
CPU
(H'AA)
Bus
interface
Module data bus
TEMP
(H'FF)
Read lower byte
CPU
(H'FF)
Bus
interface
FRCH
(H'AA)
FRCL
(H'FF)
Module data bus
TEMP
(H'FF)
FRCH
( AB )
FRCL
( 00 )
Note: H'AB00 if counter has been updated once.
Figure 9.19 Read Access to FRC (FRC → CPU)
Rev. 6.00 Sep 12, 2006 page 255 of 526
REJ09B0326-0600