Rev. 1.0, 09/02, page 100 of 568
8.2.1
DTC Mode Register A (MRA)
MRA is an 8-bit register that 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/2627
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