H8SX1663 datasheet(859/1158 Pages) RENESAS

859 / 1158 page

Section 16 USB Function Module (USB)

Rev.1.00 Jun. 07, 2006 Page 807 of 1102

REJ09B0294-0100

(1) Transition from normal operation to stall

(1-1)

Transaction request

USB

Reference

(1-2)

STALL handshake

Stall

To (2-1) or (3-1)

Normal status restored

(1-3)

(2) When Clear Feature is sent after EPSTL is cleared

(2-1)

STALL handshake

Transaction request

(2-2)

Clear Feature command

(2-3)

(3) When Clear Feature is sent before EPSTL is cleared to 0

(3-1)

1. 1 written to EPSTL

by application

1. IN/OUT token

received from host

2. EPSTL referenced

1. Transmission of

STALL handshake

1. Internal status bit

cleared to 0

1. Internal status bit

cleared to 0

2. EPSTL not changed

1. 1 set in EPSTL

2. Internal status bit

set to 1

3. Transmission of

STALL handshake

1. EPSTL cleared to 0

by application

2. IN/OUT token

received from host

3. Internal status bit

already set to 1

4. EPSTL not

referenced

5. Internal status bit

not changed

To (1-2)

Internal status bit

EPSTL

→ 1

Internal status bit

EPSTL

Internal status bit

→ 1

EPSTL

Internal status bit

EPSTL

→ 0

Internal status bit

EPSTL

Internal status bit

→ 0

EPSTL

Internal status bit

→ 0

EPSTL

Figure 16.18 Forcible Stall by Application

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