HD6412350 Hitachi, HD6412350 Datasheet - Page 233

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

ETCRB
In block transfer mode, ETCRAL functions as an 8-bit block size counter and ETCRAH holds the
block size. ETCRAL is decremented each time a 1-byte or 1-word transfer is performed, and when
the count reaches H'00, ETCRAL is loaded with the value in ETCRAH. So by setting the block
size in ETCRAH and ETCRAL, it is possible to repeatedly transfer blocks consisting of any
desired number of bytes or words.
ETCRB functions in block transfer mode, as a 16-bit block transfer counter. ETCRB is
decremented by 1 each time a block is transferred, and transfer ends when the count reaches
H'0000.
7.3.4
DMACR is a 16-bit readable/writable register that controls the operation of each DMAC channel.
In full address mode, DMACRA and DMACRB have different functions.
DMACR is initialized to H'0000 by a reset, and in standby mode.
DMACRA
DMACRB
Bit
ETCRB
Initial value
R/W
Block Transfer Counter
Bit
DMACRA
Initial value
R/W
Bit
DMACRB
Initial value
R/W
DMA Control Register (DMACR)
:
:
:
:
:
:
:
:
:
:
:
:
R/W
15
*
DTSZ
R/W
R/W
15
—
0
7
0
R/W
14
*
R/W
13
*
SAID
DAID
R/W
R/W
14
0
6
0
R/W
12
*
R/W
11
SAIDE
DAIDE
*
R/W
R/W
13
0
5
0
R/W
10
*
R/W
BLKDIR
9
*
R/W
R/W
12
—
0
4
0
R/W
8
*
R/W
7
*
BLKE
DTF3
R/W
R/W
11
0
3
0
R/W
6
*
R/W
5
*
DTF2
R/W
R/W
10
—
0
2
0
R/W
4
*
R/W
3
*
DTF1
R/W
R/W
—
9
0
1
0
R/W
2
*
R/W
DTF0
1
*
R/W
R/W
—
8
0
0
0
R/W
0
*
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