Figure 20.14 Automatic Stall By Usb Function Module - Renesas HD6417641 Hardware Manual

(1) Transition from normal operation to stall
(1-1)
STALL handshake
(2) When transaction is performed when internal status bit is set, and Clear Feature is sent
(2-1)
Transaction request
(2-2)
STALL handshake
(3) When Clear Feature is sent before transaction is performed
(3-1)
Clear Feature command

Figure 20.14 Automatic Stall by USB Function Module

Internal status bit
0 → 1
To (2-1) or (3-1)
Internal status bit
1
Internal status bit
1
Stall status maintained
Internal status bit
1 → 0
Normal status restored
Section 20 USB Function Module
1. In case of USB
specification
USBEPSTL
violation, etc., USB
0
function module
stalls endpoint
automatically
1. USBEPSTL cleared
to 0 by application
USBEPSTL
2. IN/OUT token
0
received from host
3. Internal status bit
already set to 1
4. USBEPSTL not
referenced
5. Internal status bit
not changed
1. Transmission of
USBEPSTL
STALL handshake
0
1. Internal status bit
cleared to 0
USBEPSTL
2. USBEPSTL not
0
changed
Rev. 4.00 Sep. 14, 2005 Page 783 of 982
REJ09B0023-0400