Rev. 3.0, 10/02, page 197 of 686
8.2.1
DTC Mode Register A (MRA)
MRA selects the DTC operating mode.
Bit
Bit Name Initial Value
R/W
Description
7
6
SM1
SM0
Undefined
Undefined
–
–
Source Address Mode 1 and 0
These bits specify an SAR operation after a data transfer.
0x: SAR is fixed
10: SAR is incremented after a transfer
(by + 1 when Sz = 0; by + 2 when Sz = 1)
11: SAR is decremented after a transfer
(by – 1 when Sz =0; by – 2 when Sz = 1)
5
4
DM1
DM0
Undefined
Undefined
–
–
Destination Address Mode 1 and 0
These bits specify a DAR operation after a data transfer.
0x: DAR is fixed
10: DAR is incremented after a transfer
(by + 1 when Sz = 0; by + 2 when Sz = 1)
11: DAR is decremented after a transfer
(by – 1 when Sz =0; by – 2 when Sz = 1)
3
2
MD1
MD0
Undefined
Undefined
–
–
DTC Mode
These bits specify the DTC transfer mode.
00: Normal mode
01: Repeat mode
10: Block transfer mode
11: Setting prohibited
1
DTS
Undefined
–
DTC Transfer Mode Select
Specifies whether the source side or the destination side
is set to be a repeat area or block area, in repeat mode or
block transfer mode.
0:
Destination side is repeat area or block area
1:
Source side is repeat area or block area
0
Sz
Undefined
–
DTC Data Transfer Size
Specifies the size of data to be transferred.
0:
Byte-size transfer
1:
Word-size transfer
Legend:
X: Don't care
Summary of Contents for H8S/2215 Series
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