mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 158

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Universal Serial Bus Module (USB)
9.9.1.1 Receive Control Endpoint 0
Technical Data
158
For a control OUT transaction directed at endpoint 0, the USB module
will generate an interrupt by setting the RXD0F flag in the UIR0 register.
The conditions necessary for the interrupt to occur are shown in the
flowchart in
ENDPOINT 0 RECEIVE READY TO RECEIVE?
ENDPOINT 0 RECEIVE NOT STALLED?
RECEIVE CONTROL ENDPOINT
Figure 9-29. OUT Token Data Flow for Receive Endpoint 0
RECEIVED FOR ENDPOINT 0?
ERROR FREE DATA PACKET?
RECEIVED FOR ENDPOINT 0
(RX0E = 1) AND (RXD0F = 0)
INTERRUPT GENERATED
USB MODULE ENABLED?
INTERRUPT ENABLED?
SET/CLEAR R0SEQ BIT
VALID TRANSACTION
VALID DATA TOKEN
VALID OUT TOKEN
SET RXD0F TO 1
Universal Serial Bus Module (USB)
ACCEPT DATA
(OSTALL0 = 0)
(RXD0IE = 1)
(USBEN = 1)
Figure
Y
Y
Y
Y
Y
Y
Y
9-29.
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
N
N
N
N
N
N
IGNORE TRANSACTION
FROM USB FUNCTION
FROM USB FUNCTION
NO RESPONSE FROM
USB FUNCTION
NO RESPONSE
NO RESPONSE
SEND STALL
HANDSHAKE
HANDSHAKE
SEND NAK
TIMEOUT
Freescale Semiconductor
NO INTERRUPT