mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 161

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

9.9.1.3 Transmit Endpoint 1
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Freescale Semiconductor
For an IN transaction directed at endpoint 1, the USB module will
generate an interrupt by setting the TXD1F in the UIR1 register. The
conditions necessary for the interrupt to occur are shown in
Figure
TRANSMIT ENDPOINT READY TO TRANSFER?
(TX1E = 1) AND (TXD1F = 0) AND (UE1TR = 0)
TRANSMIT ENDPOINT NOT STALLED
TRANSMIT ENDPOINT ENABLED?
TIMEOUT CONDITION OCCURS?
BY FIRMWARE (STALL1 = 1)?
RECEIVED FOR ENDPOINT 1
Figure 9-32. IN Token Data Flow for Transmit Endpoint 1
INTERRUPT GENERATED
USB MODULE ENABLED?
DATA PID SET BY T1SEQ
ACK RECEIVED AND NO
INTERRUPT ENABLED?
VALID TRANSACTION
TRANSMIT ENDPOINT
9-32.
VALID IN TOKEN
SET TXD1F TO 1
Universal Serial Bus Module (USB)
(ENABLE = 1)
(USBEN = 1)
(TXD1IE = 1)
SEND DATA
Y
Y
Y
Y
Y
Y
Y
N
N
N
N
N
N
FROM USB FUNCTION
FROM USB FUNCTION
FROM USB FUNCTION
Universal Serial Bus Module (USB)
NO RESPONSE
NO RESPONSE
NO RESPONSE
HANDSHAKE
HANDSHAKE
SEND STALL
SEND NAK
USB Interrupts
Technical Data
NO INTERRUPT
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