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8.5.2
Repeat Mode
In repeat mode, one operation transfers one byte or one word of data. Table 8.5 lists the register
information in repeat mode. From 1 to 256 transfers can be specified. Once the specified number
of transfers have ended, the initial state of the transfer counter and the address register specified as
the repeat area is restored, and transfer is repeated. In repeat mode the transfer counter value does
not reach H'00, and therefore CPU interrupts cannot be requested when DISEL = 0.
Table 8.5
Register Information in Repeat Mode
Name
Abbreviation
Function
DTC source address register
SAR
Designates source address
DTC destination address
register
DAR
Designates destination address
DTC transfer count register AH
CRAH
Holds number of transfers
DTC transfer count register AL
CRAL
Designates transfer count
DTC transfer count register B
CRB
Not used
SAR
or
DAR
DAR
or
SAR
Repeat area
Transfer
Figure 8.7 Memory Mapping in Repeat Mode
Summary of Contents for H8S/2215 Series
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