HD6433044 Datasheet, PDF (208/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

Bit 6—Data Transfer Size (DTSZ): Selects the data size of each transfer.
Bit 6
DTSZ
0
1
Description
Byte-size transfer
Word-size transfer
(Initial value)
Bit 5—Data Transfer Increment/Decrement (DTID): Selects whether to increment or
decrement the memory address register (MAR) after a data transfer in I/O mode or repeat mode.
Bit 5
DTID
0
1
Description
MAR is incremented after each data transfer
• If DTSZ = 0, MAR is incremented by 1 after each transfer
• If DTSZ = 1, MAR is incremented by 2 after each transfer
MAR is decremented after each data transfer
• If DTSZ = 0, MAR is decremented by 1 after each transfer
• If DTSZ = 1, MAR is decremented by 2 after each transfer
MAR is not incremented or decremented in idle mode.
Bit 4—Repeat Enable (RPE): Selects whether to transfer data in I/O mode, idle mode, or repeat
mode.
Bit 4
RPE
0
1
Bit 3
DTIE
0
1
0
1
Description
I/O mode
Repeat mode
Idle mode
(Initial value)
Operations in these modes are described in sections 8.4.2, I/O Mode, 8.4.3, Idle Mode, and 8.4.4,
Repeat Mode.
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