Datasheet

Section 7 Data Transfer Controller (DTC)
Rev. 3.00 Sep. 28, 2009 Page 114 of 710
REJ09B0384-0300
7.6.2 Repeat Transfer Mode
In repeat transfer mode, one activation source transfers one byte or one word of data. Table 7.6
lists the register functions in repeat transfer mode. From 1 to 256 transfers can be specified. Once
the specified number of transfers has been completed, the initial states of the transfer counter and
the address register that is specified as the repeat area is restored, and transfer is repeated. In
repeat transfer mode, the transfer counter value does not reach H'00, and therefore CPU interrupts
cannot be requested when the DISEL bit in MRB is cleared to 0.
Table 7.6 Register Functions in Repeat Transfer Mode
Name Abbreviation Function
DTC source address register SAR Transfer source address
DTC destination address register DAR Transfer destination address
DTC transfer count register AH CRAH Holds number of transfers
DTC transfer count register AL CRAL Transfer Count
DTC transfer count register B CRB Not used
Transfer
SAR
or
DAR
DAR
or
SAR
Repeat area
Figure 7.7 Memory Mapping in Repeat Transfer Mode