mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 127

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

9.5.1.2 Packet Identifier Field
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Freescale Semiconductor
The start of a packet (SOP) is signaled by the originating port by driving
the D+ and D– lines from the idle state (also referred to as the J state) to
the opposite logic level (also referred to as the K state). This switch in
levels represents the first bit of the sync field.
signaling and voltage levels for the start of packet and the sync pattern.
The packet identifier field is an 8-bit number comprised of the 4-bit
packet identification and its complement. The field follows the sync
pattern and determines the direction and type of transaction on the bus.
Table 9-2
types.
V
V
V
V
OH
SE
SE
OL
(min.)
(max)
(min.)
(min.)
V
SS
Figure 9-6. SOP, Sync Signaling, and Voltage Levels
Universal Serial Bus Module (USB)
BUS IDLE
shows the packet identifier values for the supported packet
Packet Identifier Value
Table 9-2. Supported Packet Identifiers
SOP
%1001
%0001
%1101
%0011
%1011
%0010
%1010
%1110
FIRST BIT OF PACKET
Packet Identifier Type
STALL Handshake
ACK Handshake
NAK Handshake
SETUP Token
DATA0 Packet
DATA1 Packet
Universal Serial Bus Module (USB)
OUT Token
IN Token
Figure 9-6
Functional Description
END OF SYNC
shows the data
Technical Data
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