68HC705JB3 datasheet(91/134 Pages) FREESCALE

91 / 134 page

November 5, 1998

GENERAL RELEASE SPECIFICATION

MC68HC05JB3

UNIVERSAL SERIAL BUS MODULE

MOTOROLA

REV 1

10-23

RX0E — Endpoint 0 Receive Enable

This read/write bit enables a receive to occur when the USB Host controller

sends an OUT token to Endpoint 0. Software should set this bit when data is

ready to be received. It must be cleared by software when data cannot be

received.

If this bit is 0 or the RXD0F is set, the USB will respond with a NAK handshake

to any Endpoint 0 OUT tokens. Reset clears this bit.

1 =

Data is ready to be received.

0 =

Not ready for data. Respond with NAK.

TP0SIZ3-TP0SIZ0 — Endpoint 0 Transmit Data Packet Size

These read/write bits store the number of transmit data bytes for the next IN

token request for Endpoint 0. These bits are cleared by reset.

10.5.5 USB Control Register 1 (UCR1)

T1SEQ — Endpoint1/Endpoint 2 Transmit Sequence Bit

This read/write bit determines which type of data packet (DATA0 or DATA1) will

be sent during the next IN transaction directed to Endpoint 1 or Endpoint 2.

Toggling of this bit must be controlled by software. Reset clears this bit.

1 =

DATA1 Token active for next Endpoint 1/Endpoint 2 transmit.

0 =

DATA0 Token active for next Endpoint 1/Endpoint 2 transmit.

ENDADD — Endpoint Address Select

This

read/write

bit

speciﬁes

whether

the

data

inside

the

registers

UE1D0-UE1D7 are used for Endpoint 1 or Endpoint 2. If all the conditions for a

successful Endpoint 2 USB response to a hosts IN token are satisﬁed

(TXD1F=0, TX1E=1, STALL2=0, and ENABLE2=1) except that the ENDADD bit

is conﬁgured for Endpoint 1, the USB responds with a NAK handshake packet.

1 =

The data buffers are used for Endpoint 2.

0 =

The data buffers are used for Endpoint 1.

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

UCR1

T1SEQ

ENDADD

TX1E

FRESUM TP1SZ3 TP1SIZ2 TP1SIZ1 TP1SIZ0

$003C

reset:

00000000

Figure 10-24. USB Control Register 1 (UCR1)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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