h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 388

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

Rev. 2.00, 03/04, page 356 of 534
(1) Transition from normal operation to stall
(2) When Clear Feature is sent after EPSTL0 has been cleared
(3) When Clear Feature is sent before EPSTL0 is cleared to 0
(1-1)
(1-2)
(1-3)
(2-1)
(2-2)
(2-3)
(3-1)
USB
Transaction request
Stall handshake
Transaction request
Stall handshake
Clear Feature command
Clear Feature command
Figure 12.13 Forcible Stall by Firmware
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
USB function module
To (1-3) or (1-4)
To (2-1) or (3-1)
Reference
To (1-2)
Stall
EPSTL0
EPSTL0
EPSTL0
EPSTL0
EPSTL0
EPSTL0
EPSTL0
0 → 1
1 → 0
1
1
0
0
1
1. Set EPSTL0 to 1 by
1. Receive IN/OUT
2. Refer to EPSTL0
1. EPSTL0 is set to 1
2. Set internal status
3. Transmit stall
1. Clear EPSTL0 to 0
2. Receive IN/OUT
3. Internal status bit
4. EPSTL0 is not
5. No change in
1. Transmit stall
1. Clear internal status
1. Clear internal status
2. No change in
firmware
token from the host
bit to 1
handshake
by firmware
token from the host
has been set to 1
referred to
internal status bit
handshake
bit to 0
bit to 0
EPSTL0