
Rev. 3.0, 10/02, page 198 of 686
8.2.2
DTC Mode Register B (MRB)
MRB selects the DTC operating mode.
Bit
Bit Name Initial Value
R/W
Description
7
CHNE
Undefined
–
DTC Chain Transfer Enable
When this bit is set to 1, a chain transfer will be
performed. For details, refer to section 8.5.4, Chain
Transfer. In data transfer with CHNE set to 1,
determination of the end of the specified number of
transfers, clearing of the interrupt source flag, and
cleaning of DTCER is not performed.
6
DISEL
Undefined
–
DTC Interrupt Select
When this bit is set to 1, a CPU interrupt request is
generated every time after a data transfer ends. When
this bit is set to 0, a CPU interrupt request is generated at
the time when the specified number of data transfer ends.
5
4
3
2
1
0
–
–
–
–
–
–
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
–
–
–
–
–
–
Reserved
These bits have no effect on DTC operation, and the write
value should always be 0.
8.2.3
DTC Source Address Register (SAR)
SAR is a 24-bit register that designates the source address of data to be transferred by the DTC.
For word-size transfer, specify an even source address.
8.2.4
DTC Destination Address Register (DAR)
DAR is a 24-bit register that designates the destination address of data to be transferred by the
DTC. For word-size transfer, specify an even destination address.
8.2.5
DTC Transfer Count Register A (CRA)
CRA is a 16-bit register that designates the number of times data is to be transferred by the DTC.
In normal mode, the entire CRA functions as a 16-bit transfer counter (1 to 65,536). It is
decremented by 1 every time data is transferred, and transfer ends when the count reaches H'0000.
In repeat mode or block transfer mode, the CRA is divided into two parts: the upper 8 bits (CRAH)
and the lower 8 bits (CRAL). CRAH holds the number of transfers while CRAL functions as an 8-
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