XC68HC705JB3 Motorola, XC68HC705JB3 Datasheet - Page 88

• Manufacturer Part Number: XC68HC705JB3
• Description: MICROCONTROLLER
• Manufacturer: Motorola

GENERAL RELEASE SPECIFICATION
MOTOROLA
10-20
RSTF — USB Reset Flag
SUSPND — USB Suspend Flag
TXD0IE — Endpoint 0 Transmit Interrupt Enable
RXD0IE — Endpoint 0 Receive Interrupt Enable
TXD0FR — Endpoint 0 Transmit Flag Reset
RXD0FR — Endpoint 0 Receive Flag Reset
Software must also set RX0E bit to one to enable the next data packet recep-
tion. If RXD0F bit is not cleared, a NAK handshake will be returned in the next
OUT transaction.
Reset clears this bit. Writing a logic 0 to RXD0F has no effect.
This read only bit is set when a valid reset signal state is detected on the D+
and D– lines. This reset detection will also generate an internal reset signal to
reset the CPU and other peripherals including the USB module. This bit is
cleared by writing a logic 1 to the RSTFR bit in the UCR2 register. This bit is
cleared by a POR reset.
To save power, this read/write bit should be set by the software if a 3ms con-
stant idle state is detected on USB bus. Setting this bit stops the clock to the
USB and causes the USB module to enter Suspend mode. Unnecessary ana-
log circuitry will be powered down. Software must clear this bit after the
Resume flag (RESUMF) is set while this Resume interrupt flag is serviced.
This read/write bit enables the Transmit Endpoint 0 to generate a USB interrupt
when the TXD0F bit becomes set.
This read/write bit enables the Transmit Endpoint 0 to generate a USB interrupt
when the RXD0F bit becomes set.
Writing a logic 1 to this write only bit will clear the TXD0F bit if it is set.Writing a
logic 0 to TXD0FR has no effect. Reset clears this bit.
Writing a logic 1 to this write only bit will clear the RXD0F bit if it is set.Writing a
logic 0 to RXD0FR has no effect. Reset clears this bit.
1 = Receive on Endpoint 0 has occurred.
0 = Receive on Endpoint 0 has not occurred.
1 = USB interrupts enabled for Transmit Endpoint 0.
0 = USB interrupts disabled for Transmit Endpoint 0.
1 = USB interrupts enabled for Receive Endpoint 0.
0 = USB interrupts disabled for Receive Endpoint 0.
UNIVERSAL SERIAL BUS MODULE
November 5, 1998
MC68HC05JB3
REV 1