Datasheet

Section 7 Data Transfer Controller (DTC)
Rev. 4.00 Sep 27, 2006 page 197 of 1130
REJ09B0327-0400
7.3.6 Repeat Mode
In repeat mode, one operation transfers one byte or one word of data.
From 1 to 256 transfers can be specified. Once the specified number of transfers have ended, the
initial address register state specified by the transfer counter and repeat area resumes and transfer
is repeated. In repeat mode the transfer counter does not reach H'00, and therefore CPU interrupts
cannot be requested when DISEL = 0.
Table 7.6 lists the register information in repeat mode and figure 7.7 shows memory mapping in
repeat mode.
Table 7.6 Register Information 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
Repeat area
SAR or
DAR
DAR or
SAR
Figure 7.7 Memory Mapping in Repeat Mode