r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 385

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Transfer requests (activation sources) are external requests, EP1FIFO full interrupt and EP2FIFO
empty interrupt of the USB, and auto-requests. With auto-requests, the DMAC is only activated by
register setting, and the specified number of transfers are performed automatically. With auto-
requests, cycle steal mode or burst mode can be selected. In cycle steal mode, the bus is released
to another bus master each time a transfer is performed. In burst mode, the bus is held
continuously until transfer ends.
Address T
Address B
Legend:
Address
Address
Address
Address
Where :
T
T
B
B
L
L
N
A
A
A
B
A
B
A
B
= L
= L
= L
= L
= Value set in MARA
= Value set in MARB
= Value set in ETCRA
A
B
A
B
+ SAIDE · (–1)
+ DAIDE · (–1)
Figure 7.11 Operation in Normal Mode
SAID
DAID
· (2
· (2
DTSZ
DTSZ
· (N – 1))
· (N – 1))
Transfer
Rev. 1.00 Sep. 19, 2008 Page 355 of 1342
Section 7 DMA Controller (DMAC)
REJ09B0467-0100
Address T
Address B
B
B