68HC705JB4 datasheet(91/134 Pages) FREESCALE

91 / 134 page

February 24, 1999

GENERAL RELEASE SPECIFICATION

MC68HC05JB4

UNIVERSAL SERIAL BUS MODULE

MOTOROLA

REV 2

10-25

10.5.7 USB Status Register (USR)

RSEQ — Endpoint 0 Receive Sequence Bit

This read only bit indicates the type of data packet last received for Endpoint 0

(DATA0 or DATA1).

1 =

DATA1 Token received in last Endpoint 0 receive

0 =

DATA0 Token received in last Endpoint 0 receive

SETUP — SETUP Token Detect Bit

This read only bit indicates that a valid SETUP token has been received.

1 =

Last token received for Endpoint 0 was a SETUP token

0 =

Last token received for Endpoint 0 was not a SETUP token

RPSIZ3-RPSIZ0 — Endpoint 0 Receive Data Packet Size

These read only bits store the number of data bytes received for the last OUT

or SETUP transaction for Endpoint 0. These bits are not affected by reset.

10.5.8 USB Endpoint 0 Data Registers (UE0D0-UE0D7)

UE0RD7 - UE0RD0 — Endpoint 0 Receive Data Buffer

These read only bits are serially loaded with OUT token or SETUP token data

received over the USB’s D+ and D– pins.

UE0TD7 - UE0TD0 — Endpoint 0 Transmit Data Buffer

These write only buffers are loaded by software with data to be sent on the

USB bus on the next IN token directed at Endpoint 0.

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

USR

RSEQ

SETUP

RPSIZ3

RPSIZ2

RPSIZ1

RPSIZ0

$003D

reset:

UUUUUUUU

= Unimplemented

Figure 10-26. USB Status Register (USR)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

UE0D0

UE0RD7 UE0RD6 UE0RD5 UE0RD4 UE0RD3 UE0RD2 UE0RD1 UE0RD0

$0020

UE0TD7 UE0TD6 UE0TD5 UE0TD4 UE0TD3 UE0TD2 UE0TD1 UE0TD0

::::::::

UE0D7

UE0RD7 UE0RD6 UE0RD5 UE0RD4 UE0RD3 UE0RD2 UE0RD1 UE0RD0

$0027

UE0TD7 UE0TD6 UE0TD5 UE0TD4 UE0TD3 UE0TD2 UE0TD1 UE0TD0

reset:

XXXXXXXX

Figure 10-27. USB Endpoint 0 Data Register (UE0D0-UE0D7)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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