LM3S2965-IQC20-A0T Luminary Micro, Inc., LM3S2965-IQC20-A0T Datasheet - Page 33

• Manufacturer Part Number: LM3S2965-IQC20-A0T
• Description: Microcontroller
• Manufacturer: Luminary Micro, Inc.

1.4.3.3
1.4.3.4
June 04, 2007
The LM3S2965 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.
The LM3S2965 controller includes two I
IC devices over an I
and read) data.
Devices on the I
both sending and receiving data as either a master or a slave, and also supports the simultaneous
operation as both a master and a slave. The four I
Slave Transmit, and Slave Receive.
A Stellaris
Both the I
a transmit or receive operation completes (or aborts due to an error). The I
interrupts when data has been sent or requested by a master.
Controller Area Network (see page 401)
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 a more robust twisted-pair
wire. Originally created for automotive purposes, now it is used in many embedded control
applications (for example, industrial or medical). Bit rates up to 1Mb/s are possible at network lengths
below 40 meters. Decreased bit rates allow longer network distances (for example, 125 Kb/s 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 LM3S2965 includes three CAN units.
2
C(see page 366)
2
C bus interfaces to external I
2
®
C master and slave can generate interrupts. The I
I
2
C module can operate at two speeds: Standard (100 Kbps) and Fast (400 Kbps).
2
C bus can be designated as either a master or a slave. Each I
2
C bus. The I
2
C) bus provides bi-directional data transfer through a two-wire design
2
2
C bus supports devices that can both transmit and receive (write
C devices such as serial memory (RAMs and ROMs), networking
Preliminary
2
C modules that provide the ability to communicate to other
2
2
C bus may also be used for system testing and
C modes are: Master Transmit, Master Receive,
2
C master generates interrupts when
LM3S2965 Microcontroller
2
C slave generates
2
C module supports
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