r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 963

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

16.3.24 Endpoint Stall Register 0 (EPSTL0)
Bit 0 in EPSTL0 is used to forcibly stall endpoint 0 on the application side. While the bit is set to
1, the corresponding endpoint returns a stall handshake to the host. Bit 4 is used to clear the stall
setting in bit 0. Writing 1 to the EP0 stall setting bit and stall clear bit at the same time is
prohibited.
The stall bit for endpoint 0 is cleared automatically on reception of 8-byte setup command data for
which decoding is performed by firmware the EP0 STLS bit is cleared. When the SETUPTS flag
in the IFR1 is set to 1, writing 1 to the EP0 STLS bit is ignored. For detailed operation, see section
16.7, Stall Operations.
Bit
7
6
5
4
3
2
1
0
Bit Name



EP0 STLC



EP0 STLS
Initial
Value
0
0
0
0
0
0
0
0
R/W



W



R/W
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
EP0 Stall Clear
Writing 1 to this bit clears the EP0 STLS bit to 0.
Writing 0 is ignored.
Reserved
These bits are always read as 0. The write value
should always be 0.
EP0 Stall Setting
Writing 1 to this bit specifies a stall for EP0. Writing 0
is ignored.
Rev. 1.00 Sep. 19, 2008 Page 933 of 1342
Section 16 USB Function Module (USB)
REJ09B0467-0100