r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1002

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 16 USB Function Module (USB)
Rev. 1.00 Sep. 19, 2008 Page 972 of 1342
REJ09B0467-0100
(1) Transition from normal operation to stall
(2) When Clear Feature is sent after EPSTL is cleared
(3) When Clear Feature is sent before EPSTL is cleared to 0
(1-1)
(1-2)
(1-3)
(2-1)
(2-2)
(2-3)
(3-1)
Transaction request
STALL handshake
Transaction request
STALL handshake
Clear Feature command
Clear Feature command
USB
Figure 16.19 Forcible Stall by Application
Internal status bit
Internal status bit
Internal status bit
Internal status bit
Internal status bit
Internal status bit
Internal status bit
0 → 1
1 → 0
1 → 0
0
0
1
1
Normal status restored
To (2-1) or (3-1)
Reference
To (1-2)
Stall
EPSTL
EPSTL
EPSTL
EPSTL
EPSTL
EPSTL
EPSTL
0 → 1
1 → 0
1
1
0
0
1
1. 1 written to EPSTL
1. IN/OUT token
2. EPSTL referenced
1. 1 set in EPSTL
2. Internal status bit
3. Transmission of
1. EPSTL cleared to 0
2. IN/OUT token
3. Internal status bit
4. EPSTL not
5. Internal status bit
1. Transmission of
1. Internal status bit
1. Internal status bit
2. EPSTL not changed
by application
received from host
set to 1
STALL handshake
by application
received from host
already set to 1
referenced
not changed
STALL handshake
cleared to 0
cleared to 0