mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 204

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

Universal Serial Bus Module (USB)
11.9.1.2 Transmit Control Endpoint 0
Technical Data
204
For a control IN transaction directed at endpoint 0, the USB module will
generate an interrupt by setting the TXD0F flag in the UIR1 register. The
conditions necessary for the interrupt to occur are shown in the flowchart
in
TRANSMIT ENDPOINT READY TO TRANSFER?
Figure
TRANSMIT ENDPOINT NOT STALLED
TIMEOUT CONDITION OCCURS?
Figure 11-31. IN Token Data Flow for Transmit Endpoint 0
BY FIRMWARE (ISTALL0 = 0)?
RECEIVED FOR ENDPOINT 0
(TX0E = 1) AND (TXD0F = 0)
INTERRUPT GENERATED
USB MODULE ENABLED?
DATA PID SET BY T0SEQ
ACK RECEIVED AND NO
INTERRUPT ENABLED?
TRANSMIT ENDPOINT
VALID TRANSACTION
VALID IN TOKEN
SET TXD0F TO 1
Universal Serial Bus Module (USB)
11-31.
(TXD0IE = 1)
(USBEN = 1)
SEND DATA
Y
Y
Y
Y
Y
Y
N
N
N
N
N
FROM USB FUNCTION
FROM USB FUNCTION
NO RESPONSE
NO RESPONSE
SEND STALL
HANDSHAKE
HANDSHAKE
SEND NAK
MC68HC908JB16
Freescale Semiconductor
NO INTERRUPT
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Rev. 1.1