LM3S102 Luminary Micro, Inc, LM3S102 Datasheet - Page 26

• Manufacturer Part Number: LM3S102
• Description: Lm3s102 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Architectural Overview
1.4.5
1.4.5.1
1.4.5.2
1.4.5.3
26
The I
networking devices, LCDs, tone generators, and so on. The I
testing and diagnostic purposes in product development and manufacture.
The Stellaris I
The I
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
Receive, Slave Transmit, and Slave Receive.
The Stellaris I
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.
System Peripherals
Programmable GPIOs (Section 8 on page 100)
General-purpose input/output (GPIO) pins offer flexibility for a variety of connections.
The Stellaris GPIO module is composed of three 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 up to 18 programmable input/output
pins. The number of GPIOs available depends on the peripherals being used (see Table 16-4 on
page 312 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.
Two Programmable Timers (Section 9 on page 138)
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 two GPTM blocks. Each GPTM
block provides two 16-bit timer/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 one-shot timer, periodic timer, or Real-Time
Clock (RTC). 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 (Section 10 on page 170)
A watchdog timer can generate nonmaskable interrupts (NMIs) 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.
2
2
C bus interfaces to external I
C bus supports devices that can both transmit and receive (write and read) data.
2
C master and slave can generate interrupts. The I
2
2
C module provides the ability to communicate to other IC devices over an I
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. The I
2
Preliminary
C devices such as serial memory (RAMs and ROMs),
2
C modes are: Master Transmit, Master
2
2
C master generates interrupts when
C bus may also be used for system
2
C slave generates
2
C module supports
July 6, 2006
2
C bus.