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LM3S8730-IQN20-A0T 데이터시트(PDF) 28 Page - List of Unclassifed Manufacturers

부품명 LM3S8730-IQN20-A0T
상세설명  Microcontroller
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On the LM3S8730, PWM motion control functionality can be achieved through the motion control
features of the general-purpose timers (using the CCP pins).
CCP Pins (see page 200)
The General-Purpose Timer Module's CCP (Capture Compare PWM) pins are software programmable
to support a simple PWM mode with a software-programmable output inversion of the PWM signal.
1.4.3
Serial Communications Peripherals
The LM3S8730 controller supports both asynchronous and synchronous serial communications
with:
Two fully programmable 16C550-type UARTs
One SSI module
One I
2C module
One CAN unit
1.4.3.1
UART (see page 253)
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 LM3S8730 controller includes two fully programmable 16C550-type UARTs that support data
transfer speeds up to 460.8 Kbps. (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 16x12 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.
1.4.3.2
SSI (see page 294)
Synchronous Serial Interface (SSI) is a four-wire bi-directional communications interface.
The LM3S8730 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.
The SSI module performs serial-to-parallel conversion on data received from a peripheral device,
and parallel-to-serial conversion on data transmitted to a peripheral device. The TX and RX paths
are buffered with internal FIFOs, allowing up to eight 16-bit values to be stored independently.
The SSI module can be configured as either a master or slave device. As a slave device, the SSI
module can also be configured to disable its output, which allows a master device to be coupled
with multiple slave devices.
The SSI module also includes a programmable bit rate clock divider and prescaler to generate the
output serial clock derived from the SSI module's input clock. Bit rates are generated based on the
input clock and the maximum bit rate is determined by the connected peripheral.
September 02, 2007
28
Preliminary
Architectural Overview


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