MC68HC908JG16FA MOTOROLA [Motorola, Inc], MC68HC908JG16FA Datasheet - Page 179
MC68HC908JG16FA
Manufacturer Part Number
MC68HC908JG16FA
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908JG16FA.pdf
(324 pages)
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11.7.3 USB Control Logic
11.8 I/O Registers
MC68HC908JG16
MOTOROLA
—
Rev. 1.0
The USB control logic manages data movement between the CPU and
the transceiver. The control logic handles both transmit and receive
operations on the USB. It contains the logic used to manipulate the
transceiver and the endpoint registers.
The byte count buffer is loaded with the active transmit endpoints byte
count value during transmit operations. This same buffer is used for
receive transactions to count the number of bytes received and, upon
the end of the transaction, transfer that number to the receive endpoints
byte count register.
When transmitting, the control logic handles parallel-to-serial
conversion, CRC generation, NRZI encoding, and bit stuffing.
When receiving, the control logic handles sync detection, packet
identification, end-of-packet detection, bit (un)stuffing, NRZI decoding,
CRC validation, and serial-to-parallel conversion. Errors detected by the
control logic include bad CRC, timeout while waiting for EOP, and bit
stuffing violations.
These I/O registers control and monitor USB operation:
•
•
•
•
•
•
•
Freescale Semiconductor, Inc.
For More Information On This Product,
USB address register (UADDR)
USB control registers 0–4 (UCR0–UCR4)
USB status registers 0–1 (USR0–USR1)
USB interrupt registers 0–2 (UIR0–UIR2)
USB endpoint 0 data registers 0–7 (UE0D0–UE0D7)
USB endpoint 1 data registers 0–7 (UE1D0–UE1D7)
USB endpoint 2 data registers 0–7 (UE2D0–UE2D7)
Universal Serial Bus Module (USB)
Go to: www.freescale.com
Universal Serial Bus Module (USB)
Technical Data
I/O Registers
179
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