HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 348
HD6412320
Manufacturer Part Number
HD6412320
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412320.pdf
(1302 pages)
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Section 8 Data Transfer Controller
8.2.5
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 register 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 register 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
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 65,536) that is decremented by 1
every time data is transferred, and transfer ends when the count reaches H'0000.
Rev.6.00 Sep. 27, 2007 Page 318 of 1268
REJ09B0220-0600
Bit
Initial value :
R/W
Bit
Initial value :
R/W
DTC Transfer Count Register A (CRA)
DTC Transfer Count Register B (CRB)
:
:
:
:
←⎯⎯⎯⎯⎯⎯⎯ CRAH ⎯⎯⎯⎯⎯⎯→ ←⎯⎯⎯⎯⎯⎯⎯ CRAL ⎯⎯⎯⎯⎯⎯→
Unde-
Unde-
fined
fined
15
15
—
—
Unde-
Unde-
fined
fined
14
14
—
—
Unde-
Unde-
fined
fined
13
13
—
—
Unde-
Unde-
fined
fined
12
12
—
—
Unde-
Unde-
fined
fined
11
11
—
—
Unde-
Unde-
fined
fined
10
10
—
—
Unde-
Unde-
fined
fined
—
—
9
9
Unde-
Unde-
fined
fined
—
—
8
8
Unde-
Unde-
fined
fined
—
—
7
7
Unde-
Unde-
fined
fined
—
—
6
6
Unde-
Unde-
fined
fined
—
—
5
5
Unde-
Unde-
fined
fined
—
—
4
4
Unde-
Unde-
fined
fined
—
—
3
3
Unde-
Unde-
fined
fined
—
—
2
2
Unde-
Unde-
fined
fined
—
—
1
1
Unde-
Unde-
fined
fined
—
—
0
0
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