mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 202

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Universal Serial Bus Module (USB)
11.9.1.1 Receive Control Endpoint 0
Technical Data
202
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?
Figure 11-29. OUT Token Data Flow for Receive Endpoint 0
RECEIVE CONTROL ENDPOINT
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
11-29.
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
MC68HC908JB16
Freescale Semiconductor
NO INTERRUPT
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Rev. 1.1