68HC705JB2 datasheet(73/128 Pages) NXP

73 / 128 page

August 28, 1998

GENERAL RELEASE SPECIFICATION

UNIVERSAL SERIAL BUS MODULE

REV 1.1

10-5

Figure 10-5. SOP, Sync Signaling and Voltage Levels

10.2.1.2 Packet Identiﬁer Field

The Packet Identiﬁer ﬁeld is an eight bit number comprised of the four bit packet

identiﬁcation (PID) and its complement. The ﬁeld follows the sync pattern and

determines the direction and type of transaction on the bus. Table 10-1 shows the

PID values for the supported packet types.

Table 10-1. Supported Packet Identiﬁers

10.2.1.3 Address Field (ADDR)

The Address ﬁeld is a seven bit number that is used to select a particular USB

device. This ﬁeld is compared to the lower seven bits of the UADDR register to

determine if a given transaction is targeting the MC68HC705JB2 USB device.

PID Value

PID Type

%1001

IN Token

%0001

OUT Token

%1101

SETUP Token

%0011

DATA0 Packet

%1011

DATA1 Packet

%0010

ACK Handshake

%1010

NAK Handshake

%1110

STALL Handshake

END OF SYNC

FIRST BIT OF PACKET

SOP

BUS IDLE

VOH (min)

VSE (max)

VSE (min)

VOL (min)

VSS

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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