Repeat Mode - Renesas H8S Family Hardware Manual

7.6.2

Repeat Mode

In repeat mode, one activation source transfers one byte or one word of data. Table 7.6 lists the
register functions in repeat 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 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 Mode
Name
DTC source address register
DTC destination address register
DTC transfer count register AH
DTC transfer count register AL
DTC transfer count register B
SAR
or
DAR
Abbreviation
SAR
DAR
CRAH
CRAL
CRB
Repeat area
Figure 7.6 Memory Mapping in Repeat Mode
Section 7 Data Transfer Controller (DTC)
Function
Transfer source address
Transfer destination address
Holds number of transfers
Transfer Count
Not used
Transfer
Rev. 1.00 Mar. 12, 2008 Page 177 of 1178
DAR
or
SAR
REJ09B0403-0100