HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 266
HD6433640
Manufacturer Part Number
HD6433640
Description
H8/3644 Series Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6433640.pdf
(508 pages)
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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.
258
Read upper byte
CPU
(H'AA)
Read lower byte
CPU
(H'FF)
Note: * H'AB00 if counter has been updated once.
Figure 9.19 Read Access to FRC (FRC
interface
interface
Bus
Bus
( AB )
(H'AA)
FRCH
FRCH
TEMP
(H'FF)
TEMP
(H'FF)
CPU)
( 00 )
(H'FF)
FRCL
FRCL
Module data bus
Module data bus
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