Datasheet

Table Of Contents
Section 15 Universal Serial Bus Interface (USB)
Page 574 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
(1) Transition from normal operation to stall
(1-1)
Transaction request
USB
Reference
USB function module
(1-2)
STALL handshake
Stall
To (2-1) or (3-1)
To (1-3)
Normal status restored
(1-3)
(2) When Clear Feature is sent after EPnSTL is cleared
(2-1)
STALL handshake
Transaction request
(2-2)
Clear Feature command
Clear Feature command
(2-3)
(3) When Clear Feature is sent before EPnSTL is cleared to 0
(3-1)
1. Set EPnSTL to 1 by
firmware
1. Receive IN/OUT
token from the host
2. Refer to EPnSTL
1. Transmit STALL
handshake
1. Clear internal status
bit to 0
1. Clear internal status
bit to 0
2. No change in
EPnSTL bit
1. SCME is set to 1
2. EPnSTL is set to 1
3. Set internal status
bit to 1
4. Transmit STALL
handshake
1. Clear EPnSTL to 0
by firmware
2. Receive IN/OUT
token from the host
3. Internal status bit
has been set to 1
4. EPnSTL not
referenced
5. No change in
internal status bit
To (1-2)
Internal status bit
0
EPnSTL
0 1
Internal status bit
0
EPnSTL
1
Internal status bit
0 1
EPnSTL
1 (SCME = 0)
Internal status bit
1
EPnSTL
1 0
Internal status bit
1
EPnSTL
0
Internal status bit
1 0
EPnSTL
0
Internal status bit
1 0
EPnSTL
1
Figure 15.23 Forcible Stall by Firmware