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8.5.2 Repeat
Mode
In repeat mode, one operation transfers one byte or one word of data. Table 8.3 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 8.3
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 8.6 Memory Mapping in Repeat Mode
Содержание H8S/2627
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