Hitachi H8S/2646 Hardware Manual page 907

MRA—DTC Mode Register A
Bit 7
SM1
Initial value Undefined
Read/Write —
6 5
SM0 DM1
Undefined Undefined
— —
Destination Address Mode
Source Address Mode
0 — SAR is fixed
1 0 SAR is incremented after a transfer
(by +1 when Sz = 0; by +2 when Sz = 1)
1 SAR is decremented after a transfer
(by -1 when Sz = 0; by -2 when Sz = 1)
H'EBC0–H'EFBF
4 3
DM0 MD1
Undefined Undefined
— —
DTC Mode
0
1
0 — DAR is fixed
1 0 DAR is incremented after a transfer
(by +1 when Sz = 0; by +2 when Sz = 1)
1 DAR is decremented after a transfer
(by -1 when Sz = 0; by -2 when Sz = 1)
2 1
MD0 DTS
Undefined Undefined Undefined
— —
DTC Data Transfer Size
0 Byte-size transfer
1 Word-size transfer
DTC Transfer Mode Select
0 Destination side is repeat
area or block area
1 Source side is repeat area
or block area
0 Normal mode
1 Repeat mode
0 Block transfer mode
1 —
DTC
0
Sz
—
875