Renesas H8S Family Hardware Manual page 932

Section 22 USB Function Module (USB)
(1) Transition from normal operation to stall
(1-1)
(1-2)
Transaction request
(1-3)
STALL handshake
(2) When Clear Feature is sent after EPSTL is cleared
(2-1)
Transaction request
(2-2)
STALL handshake
(2-3)
Clear Feature command
(3) When Clear Feature is sent before EPSTL is cleared to 0
(3-1)
Clear Feature command
Rev. 1.00 Mar. 12, 2008 Page 884 of 1178
REJ09B0403-0100
USB
Internal status bit
0
Internal status bit
0
Internal status bit
0 → 1
To (2-1) or (3-1)
Internal status bit
1
Internal status bit
1
Internal status bit
1 → 0
Normal status restored
Internal status bit
1 → 0
Figure 22.18 Forcible Stall by Application
EPSTL
0 → 1
Reference
EPSTL
1
Stall
EPSTL
1
EPSTL
1 → 0
EPSTL
0
EPSTL
0
EPSTL
1
To (1-2)
1. 1 written to EPSTL
by application
1. IN/OUT token
received from host
2. EPSTL referenced
1. 1 set in EPSTL
2. Internal status bit
set to 1
3. Transmission of
STALL handshake
1. EPSTL cleared to 0
by application
2. IN/OUT token
received from host
3. Internal status bit
already set to 1
4. EPSTL not
referenced
5. Internal status bit
not changed
1. Transmission of
STALL handshake
1. Internal status bit
cleared to 0
1. Internal status bit
cleared to 0
2. EPSTL not changed