E62655RUSB Renesas Electronics America, E62655RUSB Datasheet - Page 256

• Manufacturer Part Number: E62655RUSB
• Description: EMULATOR BASE H8S/2655R W/USB
• Manufacturer: Renesas Electronics America
• Type: Microcontrollerr

Specifications of E62655RUSB

• Contents: E6000 Emulator Unit and 4 Logic Probes
• For Use With/related Products: H8S/2655R
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Section 7 DMA Controller
7.2.3
ETCR is a 16-bit readable/writable register that specifies the number of transfers. The setting of
this register is different for sequential mode and idle mode on the one hand, and for repeat mode
on the other.
(1) Sequential Mode and Idle Mode
In sequential mode and idle mode, ETCR functions as a 16-bit transfer counter (with a count range
of 1 to 65536). 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.
(2) 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
Rev. 5.00 Sep 14, 2006 page 226 of 1060
REJ09B0331-0500
Transfer Number Storage
Bit
ETCRH
Initial value
R/W
Transfer Counter
Bit
ETCRL
Initial value
R/W
Legend: *: Undefined
Transfer Counter
Bit
ETCR
Initial value
R/W
Legend: *: Undefined
Execute Transfer Count Register (ETCR)
:
:
:
:
:
:
:
:
:
:
:
:
R/W
15
R/W
R/W
*
15
*
7
*
R/W
14
*
R/W
13
*
R/W
R/W
14
6
*
*
R/W
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
*
R/W
7
*
R/W
R/W
11
R/W
*
3
*
6
*
R/W
5
*
R/W
R/W
10
R/W
*
2
*
4
*
R/W
3
*
R/W
R/W
R/W
9
*
1
*
2
*
R/W
1
*
R/W
R/W
R/W
8
0
0
*
*
*