mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 160
mc68hc908jb8
Manufacturer Part Number
mc68hc908jb8
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908JB8.pdf
(286 pages)
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Universal Serial Bus Module (USB)
9.9.1.2 Transmit Control Endpoint 0
Technical Data
160
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?
BY FIRMWARE (ISTALL0 = 0)?
RECEIVED FOR ENDPOINT 0
(TX0E = 1) AND (TXD0F = 0)
Figure 9-31. IN Token Data Flow for Transmit Endpoint 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)
9-31.
(TXD0IE = 1)
(USBEN = 1)
SEND DATA
Y
Y
Y
Y
Y
Y
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
N
N
N
N
N
FROM USB FUNCTION
FROM USB FUNCTION
NO RESPONSE
NO RESPONSE
SEND STALL
HANDSHAKE
HANDSHAKE
SEND NAK
Freescale Semiconductor
NO INTERRUPT
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