LM3S1960 Luminary Micro, Inc, LM3S1960 Datasheet - Page 33
LM3S1960
Manufacturer Part Number
LM3S1960
Description
Lm3s1960 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S1960.pdf
(515 pages)
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1.4.4
1.4.4.1
1.4.4.2
1.4.4.3
July 25, 2008
The comparator can provide its output to a device pin, acting as a replacement for an analog
comparator on the board, or it can be used to signal the application via interrupts to cause it to start
capturing a sample sequence.
Serial Communications Peripherals
The LM3S1960 controller supports both asynchronous and synchronous serial communications
with:
■
■
■
UART (see page 265)
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 LM3S1960 controller includes three fully programmable 16C550-type UARTs that support 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 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.
SSI (see page 306)
Synchronous Serial Interface (SSI) is a four-wire bi-directional communications interface.
The LM3S1960 controller includes two SSI modules that provide 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.
Each 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.
Each 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.
Each 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.
I
The Inter-Integrated Circuit (I
(a serial data line SDA and a serial clock line SCL).
The I
devices, LCDs, tone generators, and so on. The I
diagnostic purposes in product development and manufacture.
2
C (see page 343)
Three fully programmable 16C550-type UARTs
Two SSI modules
Two I
2
C bus interfaces to external I
2
C modules
2
C) bus provides bi-directional data transfer through a two-wire design
2
C devices such as serial memory (RAMs and ROMs), networking
Preliminary
2
C bus may also be used for system testing and
LM3S1960 Microcontroller
33
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