h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 612

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 18 Universal Serial Bus Interface (USB)
EPDR0I
EPDR1
EPDR2
EPDR3
18.3.4
FVSRs indicate the number of valid data items stored in FIFOs in each endpoint of the USB
function core. Since endpoints 4 and 5 do not use FIFOs in the USB interface, they perform data
transfer by using the RFU which has the function corresponding to FVSRs.
In host input transfer, FVSR indicates the number of bytes that the slave CPU can write to the
FIFO (FIFO size — number of bytes that are written to the FIFO by the slave CPU but which are
not read (transmitted) by the USB function core). In host output transfer, FVSRs indicate the
number of bytes that are written to the FIFO by the USB function core but which are not read by
the slave CPU.
Rev. 3.00 Jan 25, 2006 page 560 of 872
REJ09B0286-0300
Bit
7 to 0 D7 to D0
Bit
7 to 0 D7 to D0
Bit
7 to 0 D7 to D0
Bit
7 to 0 D7 to D0
Bit Name
Bit Name
Bit Name
Bit Name
Endpoint Valid Size Registers 0S, 0O, 0I, 1, 2, and 3 (FVSR0S, FVSR0O, FVSR0I,
FVSR1, FVSR 2, and FVSR3)
Initial Value R/W
All 0
Initial Value R/W
All 0
Initial Value R/W
All 0
Initial Value R/W
All 0
W
W
R or W EPDR2 is specified as a write-only or read-only
W
Description
Endpoint 0 is used for input or output transfer and
EPDR0I is specified as a write-only register.
Description
Endpoint 1 is used for input transfer and EPDR1 is
specified as a write-only register.
Description
register depending on the transfer direction specified
by EPDIR0.
Description
Endpoint 3 is used for input transfer and EPDR3 is
specified as a write-only register.