Datasheet

Table Of Contents
Section 15 Universal Serial Bus Interface (USB)
Page 506 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
15.3.3 USB DMAC Transfer Request Register (UDMAR)
UDMAR is set when data transfer by means of a USB request of the on-chip DMAC is performed
for data registers UEDR2i, UEDR2o, UEDR4i, and UEDR4o corresponding to EP2i, EP2o, EP4i,
and EP4o used for Bulk transfer, respectively. DMAC transfer request sources specified in
UDMAR must be two or less. If two DMAC transfer request sources are specified, a source must
use DREQ0 and another source must use DREQ1. If three or more DMAC transfer requests are
specified or if DREQ0 and DREQ1 usage overlaps, the USB cannot operate correctly. For details
on DMAC transfer, refer to section 15.6, DMA Transfer Specifications.
Note: As the DREQ signal is not used in the data transfer by auto request of the on-chip DMAC,
set UDMAR to H'00.
Bit Bit Name Initial Value R/W Description
7
6
EP4oT1
EP4oT0
0
0
R/W
R/W
EP4o DMAC Transfer Request Selection 1, 0
00: Does not request EP4o DMAC transfer
01: Reserved
10: Requests EP4o DMAC transfer by DREQ0
11: Requests EP4o DMAC transfer by DREQ1
5
4
EP4iT1
EP4iT0
0
0
R/W
R/W
EP4i DMAC Transfer Request Selection 1, 0
00: Does not request EP4i DMAC transfer
01: Reserved
10: Requests EP4i DMAC transfer by DREQ0
11: Requests EP4i DMAC transfer by DREQ1
3
2
EP2oT1
EP2oT0
0
0
R/W
R/W
EP2o DMAC Transfer Request Selection 1, 0
00: Does not request EP2o DMAC transfer
01: Reserved
10: Requests EP2o DMAC transfer by DREQ0
11: Requests EP2o DMAC transfer by DREQ1
1
0
EP2iT1
EP2iT0
0
0
R/W
R/W
EP2i DMAC Transfer Request Selection 1, 0
00: Does not request EP2i DMAC transfer
01: Reserved
10: Requests EP2i DMAC transfer by DREQ0
11: Requests EP2i DMAC transfer by DREQ1