Section 18 Universal Serial Bus Interface (USB)
Rev. 3.00 Jan 25, 2006 page 559 of 872
REJ09B0286-0300
18.3.3
Endpoint Data Registers 0S, 0O, 0I, 1, 2, and 3 (EPDR0S, EPDR0O, EPDR0I,
EPDR1, EPDR2, and EPDR3)
EPDRs intervene in the data transfer between the CPU and FIFOs in each host input transfer or
host output transfer for the USB function core endpoints 1 and 2. EPDR0I, EPDR1, and EPDR3
are write-only registers used for host input transfer. EPDR0S and EPDR0O are read-only registers
used for host output transfer. EPDR2 is specified depending on the transfer direction specified in
EPDIR0. If EPDIR0 is specified as a host input transfer, EPDR2 is specified as a read-only
register; if EPDIR0 is specified as a host output transfer, EPDR2 is specified as a write-only
register.
Data written in EPDR0I, EPDR1, EPDR2 (write-only register), and EPDR3 is stored in the FIFOs
and is enabled by setting the EPTE bit in PTTER0. This enabled data is transferred to the USB
function core according to the USB function core’s request and then sent to the host.
Data sent to the host is stored in the FIFO by the USB function core and is enabled by returning an
ACK handshake after all bytes of data packet has been received. When reading EPDR0S,
EPDR0O, or EPDR2 (read-only register), data is stored in the FIFO and then enabled data is read
out in order of transfer.
EPDR is initialized to H'00 by a system reset or function software reset (see section 18.3.16, USB
Control Registers 0 and 1 (USBCR0, USBCR1)).
Note that EPDR for endpoints 4 and 5 is not supported. Data is handled by reading on-chip RAM
directly.
EPDR0S
Bit
Bit Name
Initial Value R/W
Description
7 to
0
D7 to D0
All 0
R
Endpoint 0 is used for input or output transfer and
EPDR0S is specified as a read-only register. EPDR0S
is a specific FIFO for setup command reception and is
enabled when the SETICNT bit in USBMDCR is set to
1. EPDR0S access is disabled when the SETICNT bit
is cleared to 0.
EPDR0O
Bit
Bit Name
Initial Value R/W
Description
7 to
0
D7 to D0
All 0
R
Endpoint 0 is used for input or output transfer and
EPDR0O is specified as a read-only register.
Summary of Contents for H8S/2158
Page 10: ...Rev 3 00 Jan 25 2006 page viii of lii...
Page 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Page 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
Page 54: ...Rev 3 00 Jan 25 2006 page lii of lii...
Page 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Page 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Page 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Page 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Page 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Page 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Page 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Page 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Page 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Page 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Page 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Page 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Page 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Page 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Page 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...