SH7763 Datasheet, PDF (1646/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 36 USB Function Controller (USBF)
(1) Transition from normal operation to stall
(1-1)
STALL handshake
Internal status bit
0→1
EPnSTL
0
To (2-1) or (3-1)
1. In case of USB
specification
violation, etc., USB
function module
stalls endpoint
automatically
(2) When transaction is performed when internal status bit is set, and Clear Feature is sent
(2-1)
Transaction request
Internal status bit
1
(2-2)
EPnSTL
0
1. EPnSTL cleared to
0 by application
2. IN/OUT token
received from host
3. Internal status bit
already set to 1
4. EPnSTL not
referenced
5. Internal status bit
not changed
STALL handshake
Internal status bit
1
EPnSTL
0
1. Transmission of
STALL handshake
Stall status maintained
(3) When Clear Feature is sent before transaction is performed
(3-1)
Clear Feature command
Internal status bit
1→0
EPnSTL
0
1. Internal status bit
cleared to 0
2. EPnSTL not changed
Normal status restored
Figure 36.18 Automatic Stall by USB Function Controller
Rev. 1.00 Oct. 01, 2007 Page 1580 of 1956
REJ09B0256-0100