r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 491

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

9.2
DTC has the following registers.
• DTC mode register A (MRA)
• DTC mode register B (MRB)
• DTC source address register (SAR)
• DTC destination address register (DAR)
• DTC transfer count register A (CRA)
• DTC transfer count register B (CRB)
These six registers cannot be directly accessed from the CPU. When activated, the DTC reads a
set of register information that is stored in an on-chip RAM to the corresponding DTC registers
and transfers data. After the data transfer, it writes a set of updated register information back to the
RAM.
• DTC enable registers A to I (DTCERA to DTCERI)
• DTC vector register (DTVECR)
• DTC control register (DTCCR)
9.2.1
MRA selects the DTC operating mode.
Bit
7
6
Bit Name
SM1
SM0
Register Descriptions
DTC Mode Register A (MRA)
Initial Value
Undefined
Undefined
R/W
—
—
Description
Source Address Mode 1 and 0
These bits specify an SAR operation after a data
transfer.
0×: SAR is fixed
10: SAR is incremented after a transfer
11: SAR is decremented after a transfer
(by +1 when Sz = 0; by +2 when Sz = 1)
(by –1 when Sz = 0; by –2 when Sz = 1)
Rev. 1.00 Sep. 19, 2008 Page 463 of 1270
Section 9 Data Transfer Controller (DTC)
REJ09B0466-0100