HC705JB2GRSSLASHH datasheet(88/128 Pages) NXP

88 / 128 page

GENERAL RELEASE SPECIFICATION

August 28, 1998

UNIVERSAL SERIAL BUS MODULE

MC68HC705JB2

10-20

REV 1.1

1 =

Receive on Endpoint 0 has occurred

0 =

Receive on Endpoint 0 has not occurred

RSTF — USB Reset Flag

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.

SUSPND — USB Suspend Flag

To save power, this read/write bit should be set by the software if a 3ms

constant 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

analog circuitry will be powered down. Software must clear this bit after the

Resume ﬂag (RESUMF) is set while this Resume interrupt ﬂag is serviced.

TXD0IE — Endpoint 0 Transmit Interrupt Enable

This read/write bit enables the Transmit Endpoint 0 to generate a USB interrupt

when the TXD0F bit becomes set.

1 =

USB interrupts enabled for Transmit Endpoint 0

0 =

USB interrupts disabled for Transmit Endpoint 0

RXD0IE — Endpoint 0 Receive Interrupt Enable

This read/write bit enables the Transmit Endpoint 0 to generate a USB interrupt

when the RXD0F bit becomes set.

1 =

USB interrupts enabled for Receive Endpoint 0

0 =

USB interrupts disabled for Receive Endpoint 0

TXD0FR — Endpoint 0 Transmit Flag Reset

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.

RXD0FR — Endpoint 0 Receive Flag Reset

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.

10.5.3 USB Interrupt Register 1 (UIR1)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

UIR1

TXD1F

EOPF

RESUMF

TXD1IE

EOPIE

$003A

RESUMFR

TXD1FR

EOPFR

reset

⇒

00000000

= Unimplemented

Figure 10-22. USB Interrupt Register 1(UIR1)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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