Datasheet

Section 7 Data Transfer Controller (DTC)
Rev. 3.00 Mar 21, 2006 page 157 of 788
REJ09B0300-0300
7.5.2 Repeat Mode
In repeat mode, one activation source transfers one byte or one word of data. Table 7.3 lists the
register functions in repeat mode. From 1 to 256 transfers can be specified. Once the specified
number of transfers have 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 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 7.3 Register Functions in Repeat 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 7.6 Memory Mapping in Repeat Mode