h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 201

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

7.3.6
USTCR specifies the transfer source from the on-chip USB, etc.
Bit
15
14
13
Bit Name
EP1DMAE
URCHS1
URCHS0
USB Transfer Control Register (USTCR)
0
Initial
Value
0
0
R/W
R/W
R/W
R/W
Endpoint 1 (EP1) DMA Enable
Description
Enables a transfer source from the on-chip USB
(transfer direction: reading from the on-chip USB
(EP1)). When this bit is set to 1, a transfer request from
the USB is selected as a transfer source.
In block transfer mode, the on-chip USB request must
not be set as an activation source. While the DA bit in
DMMDR is set to 1, the EP1DMAE value must not be
changed.
0: Transfer request from on-chip USB (EP1) not
1: Transfer request from on-chip USB (EP1) accepted.
USB Read Channel Select
When the DMA transfer is performed by a transfer
request from the USB (EP1), these bits select the
DMAC channel to be used. When the channel which
accepts a request is selected and the EP1DMAE bit is
set to 1, the corresponding channel accepts a USB
request rather than an external request. In this case,
the transfer direction is reading from the USB (EP1).
Therefore, the source address must be specified as the
FIFO in the USB (EP1).
While the DA bit in DMMDR is set to 1, these bits must
not be changed. A transfer request from the endpoint 1
(EP1) (reading from the on-chip USB) or a transfer
request from the endpoint 2 (EP2) (writing to the on-
chip USB) must not be set to the same channel.
00: Channel 0 can accept the EP1 transfer request.
01: Channel 1 can accept the EP1 transfer request.
10: Channel 2 can accept the EP1 transfer request.
11: Channel 3 can accept the EP1 transfer request.
The DREQ pin on the corresponding channel is not
available.
accepted.
Rev. 2.00, 03/04, page 169 of 534