– Register-programmable transmit amplitude
– Automatic polarity correction and 10BASE-T signal reception
1.3.5.2 Controller Area Network (CAN) (see page 1356)
Controller Area Network (CAN) is a multicast shared serial-bus standard for connecting electronic
control units (ECUs). CAN was specifically designed to be robust in electromagnetically noisy
environments and can utilize a differential balanced line like RS-485 or twisted-pair wire. Originally
created for automotive purposes, it is now used in many embedded control applications (for example,
industrial or medical). Bit rates up to 1 Mbps are possible at network lengths below 40 meters.
Decreased bit rates allow longer network distances (for example, 125 Kbps at 500m).
A transmitter sends a message to all CAN nodes (broadcasting). Each node decides on the basis
of the identifier received whether it should process the message. The identifier also determines the
priority that the message enjoys in competition for bus access. Each CAN message can transmit
from 0 to 8 bytes of user information.
The TM4C1294NCPDT microcontroller includes two CAN units with the following features:
■ CAN protocol version 2.0 part A/B
■ Bit rates up to 1 Mbps
■ 32 message objects with individual identifier masks
■ Maskable interrupt
■ Disable Automatic Retransmission mode for Time-Triggered CAN (TTCAN) applications
■ Programmable loopback mode for self-test operation
■ Programmable FIFO mode enables storage of multiple message objects
■ Gluelessly attaches to an external CAN transceiver through the CANnTX and CANnRX signals
1.3.5.3 Universal Serial Bus (USB) (see page 1644)
Universal Serial Bus (USB) is a serial bus standard designed to allow peripherals to be connected
and disconnected using a standardized interface without rebooting the system.
The TM4C1294NCPDT microcontroller has one USB controller that supports high and full speed
multi-point communications and complies with the USB 2.0 standard for high-speed function. The
USB controller can have three configurations: USB Device, USB Host, and USB On-The-Go
(negotiated on-the-go as host or device when connected to other USB-enabled systems). Support
for full-speed communication is provided by using the integrated USB PHY or optionally, a high-speed
ULPI interface can communicate to an external PHY.
The USB module has the following features:
■ Complies with USB-IF (Implementer's Forum) certification standards
■ USB 2.0 high-speed (480 Mbps) operation with the integrated ULPI interface communicating
with an external PHY
■ Link Power Management support which uses link-state awareness to reduce power usage
■ 4 transfer types: Control, Interrupt, Bulk, and Isochronous
63June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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