HD6417727BP160CV Datasheet, PDF (779/1098 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family/ SH7700 Series

Section 23 USB Function Controller
(1) Transition from normal operation to stall
(1-1)
STALL handshake
Internal status bit
0→1
USBEPSTL
0
To (2-1) or (3-1)
1. In case of USB
specification
violation, etc., USB
function module
stalls endpoint
automatically
(2) When Clear Feature is sent after USBEPSTL is cleared
(2-1)
Transaction request
Internal status bit
1
USBEPSTL
0
(2-2)
STALL handshake
Internal status bit
1
USBEPSTL
0
1. USBEPSTL cleared
to 0 by application
2. IN/OUT token
received from host
3. Internal status bit
already set to 1
4. USBEPSTL not
referenced
5. Internal status bit
not changed
1. Transmission of
STALL handshake
Stall status maintained
(3) When Clear Feature is sent before USBEPSTL is cleared to 0
(3-1)
Clear Feature command
Internal status bit
1→0
USBEPSTL
0
1. Internal status bit
cleared to 0
2. USBEPSTL not
changed
Normal status restored
Figure 23.14 Automatic Stall by USB Function Module
Rev.6.00 Mar. 27, 2009 Page 721 of 1036
REJ09B0254-0600