h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 214

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 8 Data Transfer Controller (DTC)
8.2.5
Bit
Initial value
R/W
CRA is a 16-bit register that designates the number of times data is to be transferred by the DTC.
In normal mode, the entire CRA functions as a 16-bit transfer counter (1 to 65,536). It is
decremented by 1 every time data is transferred, and transfer ends when the count reaches H'0000.
In repeat mode or block transfer mode, the CRA is divided into two parts: the upper 8 bits
(CRAH) and the lower 8 bits (CRAL). CRAH holds the number of transfers while CRAL
functions as an 8-bit transfer counter (1 to 256). CRAL is decremented by 1 every time data is
transferred, and the contents of CRAH are sent when the count reaches H'00. This operation is
repeated.
8.2.6
Bit
Initial value
R/W
CRB is a 16-bit register that designates the number of times data is to be transferred by the DTC in
block transfer mode. It functions as a 16-bit transfer counter (1 to 65536) that is decremented by 1
every time data is transferred, and transfer ends when the count reaches H'0000.
Rev. 5.00 Sep 22, 2005 page 188 of 1136
REJ09B0257-0500
DTC Transfer Count Register A (CRA)
DTC Transfer Count Register B (CRB)
:
:
:
:
:
:
15
15
—
—
*
*
14
14
—
—
*
*
13
13
—
—
*
*
12
12
—
—
*
*
CRAH
11
11
—
—
*
*
10
10
—
—
*
*
—
—
9
9
*
*
—
—
8
8
*
*
—
—
7
7
*
*
—
—
6
6
*
*
—
—
5
5
*
*
—
—
4
4
*
*
CRAL
—
—
3
3
*
*
—
—
2
2
*
*
*: Undefined
*: Undefined
—
—
1
1
*
*
—
—
0
0
*
*