m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 216

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Figure 2.8.50. USB DMAx(x=0 to 3) request register
2.8.8 USB Operation (Interface with DMAC Transfer)
USB DMAx Request registers
(b15)
0 0 0 0 0
b7
The M30245 group can select a USB (USB0/USB1/USB2/USB3) as the DMA request factor. The USB0
corresponds to DMA0, USB1 to DMA1, USB2 to DMA2, and USB3 to DMA3. The DMA request factor
origin of USB0/USB1/USB2/USB3 is also set by setting any one of endpoints 1 to 4 IN/OUT factors to
USB DMAx(x=0 to 3) request register .
The DMA request factor of USB0/USB1/USB2/USB3 occurs, under particular conditions, not only on
occurrence of an interrupt request of each endpoint but also on write/read to/from IN/OUT FIFO.
(1) Related Registers
This register sets the DMA request factor origin of USB0/USB1/USB2/USB3. When, under particular
conditions, write/read to/from the FIFO of the endpoint selected by this register or an event such as
the endpoint's interrupt request occurs, a DMA request occurs. This register can be set “1” only to 1
bit. When multiple bits are simultaneously set to “1”, the setting becomes invalid. Other DMA related
registers also need to be set before a valid value is set; for example, “00011
USB3) is set to DMA request cause select bits (b4,b3,b2,b1,b0) of DMAx(x=0 to 3) request cause
select register (addresses 03B8
The configuration of USB DMAx(x=0 to 3) request register is shown in Figure 2.8.50.
USB DMAx(x=0 to 3) request register
0
(b8)
b0
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b7
0
16
, 03BA
b0
0
Bit Symbol
Reserved
DMAxR1
DMAxR2
DMAxR3
DMAxR4
DMAxR6
DMAxR7
DMAxR8
DMAxR9
Reserved
Reserved
16
Symbol
USBDMAx (x=0 to 3)
, 03B0
EP1 IN FIFO write request select bit
EP2 IN FIFO write request select bit
EP3 IN FIFO write request select bit
EP4 IN FIFO write request select bit
EP1 OUT FIFO read request select bit
EP2 OUT FIFO read request select bit
EP3 OUT FIFO read request select bit
EP4 OUT FIFO read request select bit
16
, 03B2
Bit Name
16
0290
0294
).
Address
16
16
, 0292
, 0296
16
16
,
Must always be set to “0”
Must always be set to “0”
Must always be set to “0”
1 : Selected
0 : Not selected
1 : Selected
0 : Not selected
2
” (USB0/USB1/USB2/
When reset
0000
Function
16
2. USB function
O O
O O
O O
R W
O O
O O