LM3S300-IQN25-C2 Datasheet, PDF (37/498 Pages) Texas Instruments – Stellaris LM3S300 Microcontroller

NRND: Not recommended for new designs.
Stellaris^® LM3S300 Microcontroller
1.4.5
1.4.5.1
1.4.5.2
1.4.5.3
1.4.6
operation as both a master and a slave. The four I²C modes are: Master Transmit, Master Receive,
Slave Transmit, and Slave Receive.
A Stellaris I²C module can operate at two speeds: Standard (100 Kbps) and Fast (400 Kbps).
Both the I²C master and slave can generate interrupts. The I²C master generates interrupts when
a transmit or receive operation completes (or aborts due to an error). The I²C slave generates
interrupts when data has been sent or requested by a master.
System Peripherals
Programmable GPIOs (see page 222)
General-purpose input/output (GPIO) pins offer flexibility for a variety of connections.
The Stellaris GPIO module is comprised of five physical GPIO blocks, each corresponding to an
individual GPIO port. The GPIO module is FiRM-compliant (compliant to the ARM Foundation IP
for Real-Time Microcontrollers specification) and supports 8-36 programmable input/output pins.
The number of GPIOs available depends on the peripherals being used (see “Signal
Tables” on page 450 for the signals available to each GPIO pin).
The GPIO module features programmable interrupt generation as either edge-triggered or
level-sensitive on all pins, programmable control for GPIO pad configuration, and bit masking in
both read and write operations through address lines. Pins configured as digital inputs are
Schmitt-triggered.
Three Programmable Timers (see page 262)
Programmable timers can be used to count or time external events that drive the Timer input pins.
The Stellaris General-Purpose Timer Module (GPTM) contains three GPTM blocks. Each GPTM
block provides two 16-bit timers/counters that can be configured to operate independently as timers
or event counters, or configured to operate as one 32-bit timer or one 32-bit Real-Time Clock (RTC).
When configured in 32-bit mode, a timer can run as a Real-Time Clock (RTC), one-shot timer or
periodic timer. When in 16-bit mode, a timer can run as a one-shot timer or periodic timer, and can
extend its precision by using an 8-bit prescaler. A 16-bit timer can also be configured for event
capture or Pulse Width Modulation (PWM) generation.
Watchdog Timer (see page 298)
A watchdog timer can generate an interrupt or a reset when a time-out value is reached. The
watchdog timer is used to regain control when a system has failed due to a software error or to the
failure of an external device to respond in the expected way.
The Stellaris Watchdog Timer module consists of a 32-bit down counter, a programmable load
register, interrupt generation logic, and a locking register.
The Watchdog Timer can be configured to generate an interrupt to the controller on its first time-out,
and to generate a reset signal on its second time-out. Once the Watchdog Timer has been configured,
the lock register can be written to prevent the timer configuration from being inadvertently altered.
Memory Peripherals
The LM3S300 controller offers both single-cycle SRAM and single-cycle Flash memory.
June 18, 2012
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