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8.5.3
Block Transfer Mode
In block transfer mode, one operation transfers one block of data. Either the transfer source or the
transfer destination is designated as a block area. Table 8.4 lists the register information in block
transfer mode.
The block size can be between 1 and 256. When the transfer of one block ends, the initial state of
the block size counter and the address register specified as the block area is restored. The other
address register is then incremented, decremented, or left fixed.
From 1 to 65,536 transfers can be specified. Once the specified number of transfers have been
completed, a CPU interrupt is requested.
Table 8.4
Register Information in Block Transfer 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 block size
DTC transfer count register AL
CRAL
Designates block size count
DTC transfer count register B
CRB
Transfer count
First block
Transfer
Block area
Nth block
DAR
or
SAR
SAR
or
DAR
Figure 8.7 Memory Mapping in Block Transfer Mode
Содержание H8S/2627
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