r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 190

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 8 Data Transfer Controller (DTC)
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 transfer mode, CRA functions as a 16-bit transfer counter (1 to 65,536). It is
decremented by 1 every time data is transferred, and bit DTCEn (n = 15 to 0) corresponding to the
activation source is cleared and then an interrupt is requested to the CPU when the count reaches
H'0000. The transfer count is 1 when CRA = H'0001, 65,535 when CRA = H'FFFF, and 65,536
when CRA = H'0000.
In repeat transfer mode, CRA is divided into two parts: the upper eight bits (CRAH) and the lower
eight 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 to CRAL when the count reaches H'00. The transfer count is 1 when
CRAH = CRAL = H'01, 255 when CRAH = CRAL = H'FF, and 256 when CRAH = CRAL =
H'00.
In block transfer mode, CRA is divided into two parts: the upper eight bits (CRAH) and the lower
eight bits (CRAL). CRAH holds the block size while CRAL functions as an 8-bit block-size
counter (1 to 256 for byte, word, or longword). CRAL is decremented by 1 every time a byte
(word or longword) data is transferred, and the contents of CRAH are sent to CRAL when the
count reaches H'00. The block size is 1 byte (word or longword) when CRAH = CRAL =H'01,
255 bytes (words or longwords) when CRAH = CRAL = H'FF, and 256 bytes (words or
longwords) when CRAH = CRAL =H'00.
CRA cannot be accessed directly from the CPU.
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Rev. 1.00 Sep. 21, 2007 Page 164 of 1124
REJ09B0402-0100
: Undefined
Initial value:
R/W:
Bit:
DTC Transfer Count Register A (CRA)
15
*
-
14
*
-
13
*
-
12
*
-
11
*
-
10
*
-
9
*
-
8
*
-
7
*
-
6
*
-
5
*
-
4
*
-
3
*
-
2
*
-
1
*
-
0
*
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