Datasheet

Table Of Contents
Section 15 Universal Serial Bus Interface (USB)
Page 576 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
(1) Transition from normal operation to stall
(1-1)
(2) When transaction is performed when internal status bit is set
(2-1)
STALL handshake
Transaction request
STALL handshake
(2-2)
Clear Feature command
(3) When Clear Feature is sent before transaction is performed
(3-1)
1. In case of USB
specification
violation, USB
function module
stalls endpoint
automatically.
1. Transmit STALL
handshake
1. Clear the internal
status bit to 0
2. No change in
EPnSTL
1. Receive IN/OUT
token from the host
2. Internal status bit
has been set to 1
3. EPnSTL not
referenced
4. No change internal
status bit
Normal status restored
Internal status bit
0 1
EPnSTL
0
Internal status bit
1
EPnSTL
0
Internal status bit
1
EPnSTL
0
Internal status bit
1 0
EPnSTL
0
Stall status maintained
USB function module
To (2-1) or (3-1)
Figure 15.24 Automatic Stall by USB Function Module