mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 126

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

Universal Serial Bus Module (USB)
9.5.1.1 Sync Pattern
Technical Data
126
Each USB transaction is comprised of a series of packets. The USB
module supports the packet types shown in
are generated by the USB host and decoded by the USB device. Data
and handshake packets are both decoded and generated by the USB
device, depending on the type of transaction.
The following sections detail each segment used to form a complete
USB transaction.
The NRZI bit pattern shown in
pattern and is prefixed to each packet. This pattern is equivalent to a
data pattern of seven 0s followed by a 1 ($80).
Token Packet:
Data Packet:
Handshake Packet:
NRZI Data
IN
OUT
SETUP
DATA0
DATA1
ACK
NAK
STALL
Encoding
Universal Serial Bus Module (USB)
Figure 9-4. Supported USB Packet Types
Idle
SYNC
SYNC
SYNC
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Figure 9-5. Sync Pattern
PID
PID
PID
Figure 9-5
PID
PID
PID
SYNC PATTERN
ADDR
EOP
0 – 8 Bytes
is used as a synchronization
Figure
DATA
ENDP
Freescale Semiconductor
9-4. Token packets
CRC16
CRC5
PID0 PID1
EOP
EOP