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8.3.7
Block Transfer Mode
In block transfer mode, one operation transfers one block of data.
The block size is 1 to 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 ended, a CPU interrupt is
requested.
Table 8-7 lists the register information in block transfer mode and figure 8-8 shows memory mapping in block transfer
mode.
Table 8-7
Register Information in Block Transfer Mode
Name
Abbreviation
Function
DTC source address register
SAR
Designates transfer 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
Transfer
SAR or
DAR
DAR or
SAR
Block area
First block
Nth block
·
·
·
Figure 8-8 Memory Mapping in Block Transfer Mode
Содержание ZTAT H8S/2357F
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