LM3S2776 Datasheet, PDF (47/785 Pages) Texas Instruments – Stellaris® LM3S2776 Microcontroller

Stellaris® LM3S2776 Microcontroller
1.4.3
1.4.3.1
1.4.4
1.4.4.1
1.4.4.2
Fault Pins (see page 661)
The LM3S2776 PWM module includes three fault-condition handling inputs to quickly provide
low-latency shutdown and prevent damage to the motor being controlled.
Analog Peripherals
To handle analog signals, the LM3S2776 microcontroller offers an Analog-to-Digital Converter
(ADC).
ADC (see page 453)
An analog-to-digital converter (ADC) is a peripheral that converts a continuous analog voltage to a
discrete digital number.
The LM3S2776 ADC module features 10-bit conversion resolution and supports six input channels,
plus an internal temperature sensor. Four buffered sample sequences allow rapid sampling of up
to eight analog input sources without controller intervention. Each sample sequence provides flexible
programming with fully configurable input source, trigger events, interrupt generation, and sequence
priority.
Serial Communications Peripherals
The LM3S2776 controller supports both asynchronous and synchronous serial communications
with:
■ One fully programmable 16C550-type UART
■ One SSI module
■ One I²C module
■ One CAN unit
UART (see page 489)
A Universal Asynchronous Receiver/Transmitter (UART) is an integrated circuit used for RS-232C
serial communications, containing a transmitter (parallel-to-serial converter) and a receiver
(serial-to-parallel converter), each clocked separately.
The LM3S2776 controller includes one fully programmable 16C550-type UARTthat supports data
transfer speeds up to 3.125 Mbps. (Although similar in functionality to a 16C550 UART, it is not
register-compatible.) In addition, each UART is capable of supporting IrDA.
Separate 16x8 transmit (TX) and receive (RX) FIFOs reduce CPU interrupt service loading. The
UART can generate individually masked interrupts from the RX, TX, modem status, and error
conditions. The module provides a single combined interrupt when any of the interrupts are asserted
and are unmasked.
SSI (see page 532)
Synchronous Serial Interface (SSI) is a four-wire bi-directional full and low-speed communications
interface.
The LM3S2776 controller includes one SSI module that provides the functionality for synchronous
serial communications with peripheral devices, and can be configured to use the Freescale SPI,
MICROWIRE, or TI synchronous serial interface frame formats. The size of the data frame is also
configurable, and can be set between 4 and 16 bits, inclusive.
November 17, 2011
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Texas Instruments-Production Data