Datasheet

Section 7 Data Transfer Controller

Rev.7.00 Feb. 14, 2007 page 203 of 1108

REJ09B0089-0700

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 state of the transfer counter and the address register 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 DISEL = 0.

Table 7.7 lists the register information in repeat mode and figure 7.7 shows the memory map in

repeat mode.

Table 7.7 Register Information in Repeat Mode

Name Abbreviation Function

DTC source address register SAR Designates source address

DTC destination address register DAR Designates destination address

DTC transfer count register AH CRAH Holds number of transfers

DTC transfer count register AL CRAL Transfer counter

DTC transfer count register B CRB Not used

Transfer

SAR or

DAR

DAR o

SAR

Repeat area

Figure 7.7 Memory Map in Repeat Mode