TM4C1237E6PZ Datasheet, PDF (50/1306 Pages) Texas Instruments – Tiva Microcontroller

Architectural Overview
1.3.3
1.3.3.1
■ Interrupt support for write completion to avoid polling
■ Endurance of 500K writes (when writing at fixed offset in every alternate page in circular fashion)
to 15M operations (when cycling through two pages ) per each 2-page block.
Serial Communications Peripherals
The TM4C1237E6PZ controller supports both asynchronous and synchronous serial communications
with:
■ CAN 2.0 A/B controller
■ USB 2.0 OTG/Host/Device
■ Eight UARTs with IrDA, 9-bit and ISO 7816 support.
■ Six I²C modules with four transmission speeds including high-speed mode
■ Four Synchronous Serial Interface modules (SSI)
The following sections provide more detail on each of these communications functions.
Controller Area Network (CAN) (see page 1040)
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 TM4C1237E6PZ microcontroller includes one CAN unit 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
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June 12, 2014
Texas Instruments-Production Data