H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 251

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

(2) Block Transfer Mode
ETCRA:
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.
Bit
ETCRB
Initial value
R/W
Block Transfer Counter
Holds block size
Bit
ETCRAH
Initial value
R/W
Block size counter
Bit
ETCRAL
Initial value
R/W
:
:
:
:
:
:
:
:
:
:
:
:
R/W
15
*
R/W
R/W
15
R/W
*
7
*
14
*
R/W
13
*
R/W
R/W
14
R/W
6
*
*
12
*
R/W
11
*
R/W
R/W
13
*
5
*
R/W
10
*
R/W
9
*
R/W
R/W
12
4
*
*
R/W
8
*
Rev. 3.00 Sep 15, 2006 page 217 of 988
R/W
7
*
R/W
R/W
11
3
*
*
R/W
Section 7 DMA Controller (DMAC)
6
*
R/W
R/W
R/W
5
*
10
2
*
*
R/W
4
*
R/W
R/W
R/W
3
*
REJ09B0330-0300
9
1
*
*
R/W
*: Undefined
2
*
R/W
R/W
R/W
1
*
8
0
*
*
R/W
0
*