MC68HC908LD64 Datasheet, PDF (211/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Universal Serial Bus Module (USB)
Embedded Device Function I/O Registers
TX0E must also be set. If TXD0F bit is not cleared, a NAK handshake
will be returned in the next IN transaction. TXD0F generates an
interrupt request to the CPU if the TXD0IE bit is also set. Writing to
TXD0F has no effect. Reset clears this bit.
1 = Transmit on embedded device endpoint 0 has occurred
0 = Transmit on embedded device endpoint 0 has not occurred
RXD0F — Embedded Device Endpoint 0 Data Receive Flag
This read-only bit is set after the USB embedded device module has
received a data packet and responded with an ACK handshake
packet. Software must clear this flag by writing a logic 1 to the
RXD0FR bit after all data received have been read. To enable the
next data packet reception, RX0E must also be set. If RXD0F bit is not
cleared, a NAK handshake will be returned in the next OUT
transaction. RXD0F generates an interrupt request to CPU if the
RXD0IE bit is also set. Writing to RXD0F has no effect. Reset clears
this bit.
1 = Receive on embedded device endpoint 0 has occurred
0 = Receive on embedded device endpoint 0 has not occurred
TXD0IE — Embedded Device Endpoint 0 Transmit Interrupt Enable
This read/write bit enables the TXD0F bit to generate CPU interrupt
request when set. Reset clears the TXD0IE bit.
1 = TXD0F CPU interrupt requests enabled
0 = TXD0F CPU interrupt requests disabled
RXD0IE — Embedded Device Endpoint 0 Receive Interrupt Enable
This read/write bit enables the RXD0F bit to generate CPU interrupt
request when set. Reset clears the RXD0IE bit.
1 = RXD0F CPU interrupt requests enabled
0 = RXD0F CPU interrupt requests disabled
TXD0FR — Embedded Device Endpoint 0 Transmit Flag Reset
Writing a logic 1 to this write-only bit will clear the TXD0F bit if it is set.
Reset clears this bit.
1 = Write 1 to clear TXD0F bit
0 = No effect
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor
Universal Serial Bus Module (USB)
Data Sheet
211