HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 256

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 7 DMA Controller (Not Supported in the H8S/2321)
In sequential mode and idle mode, ETCR functions as a 16-bit transfer counter (with a count range
of 1 to 65,536). ETCR is decremented by 1 each time a transfer is performed, and when the count
reaches H'0000, the DTE bit in DMABCR is cleared, and transfer ends.
Repeat Mode
In repeat mode, ETCR functions as transfer counter ETCRL (with a count range of 1 to 256) and
transfer number storage register ETCRH. ETCRL is decremented by 1 each time a transfer is
performed, and when the count reaches H'00, ETCRL is loaded with the value in ETCRH. At this
point, MAR is automatically restored to the value it had when the count was started. The DTE bit
in DMABCR is not cleared, and so transfers can be performed repeatedly until the DTE bit is
cleared by the user.
ETCR is not initialized by a reset or in standby mode.
Rev.6.00 Sep. 27, 2007 Page 226 of 1268
REJ09B0220-0600
Transfer Number Storage (ETCRH)
Bit
Initial value :
R/W
Transfer Counter (ETCRL)
Bit
Initial value :
R/W
:
:
:
:
R/W
R/W
15
*
7
*
R/W
R/W
14
6
*
*
R/W
R/W
13
5
*
*
R/W
R/W
12
*
4
*
R/W
R/W
11
3
*
*
R/W
R/W
10
2
*
*
R/W
R/W
9
*
1
*
*: Undefined
R/W
R/W
8
0
*
*