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LM3S8630-IQR80-A2 데이터시트(PDF) 34 Page - Texas Instruments

부품명 LM3S8630-IQR80-A2
상세설명  Stellaris짰 LM3S8630 Microcontroller
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LM3S8630-IQR80-A2 데이터시트(HTML) 34 Page - Texas Instruments

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1.4
Functional Overview
The following sections provide an overview of the features of the LM3S8630 microcontroller. The
page number in parenthesis indicates where that feature is discussed in detail. Ordering and support
information can be found in “Ordering and Contact Information” on page 540.
1.4.1
ARM Cortex™-M3
1.4.1.1
Processor Core (see page 40)
All members of the Stellaris
® product family, including the LM3S8630 microcontroller, are designed
around an ARM Cortex™-M3 processor core. The ARM Cortex-M3 processor provides the core for
a high-performance, low-cost platform that meets the needs of minimal memory implementation,
reduced pin count, and low-power consumption, while delivering outstanding computational
performance and exceptional system response to interrupts.
“ARM Cortex-M3 Processor Core” on page 40 provides an overview of the ARM core; the core is
detailed in the ARM® Cortex™-M3 Technical Reference Manual.
1.4.1.2
System Timer (SysTick) (see page 43)
Cortex-M3 includes an integrated system timer, SysTick. SysTick provides a simple, 24-bit
clear-on-write, decrementing, wrap-on-zero counter with a flexible control mechanism. The counter
can be used in several different ways, for example:
■ An RTOS tick timer which fires at a programmable rate (for example, 100 Hz) and invokes a
SysTick routine.
■ A high-speed alarm timer using the system clock.
■ A variable rate alarm or signal timer—the duration is range-dependent on the reference clock
used and the dynamic range of the counter.
■ A simple counter. Software can use this to measure time to completion and time used.
■ An internal clock source control based on missing/meeting durations. The COUNTFLAG bit-field
in the control and status register can be used to determine if an action completed within a set
duration, as part of a dynamic clock management control loop.
1.4.1.3
Nested Vectored Interrupt Controller (NVIC) (see page 48)
The LM3S8630 controller includes the ARM Nested Vectored Interrupt Controller (NVIC) on the
ARM® Cortex™-M3 core. The NVIC and Cortex-M3 prioritize and handle all exceptions. All exceptions
are handled in Handler Mode. The processor state is automatically stored to the stack on an
exception, and automatically restored from the stack at the end of the Interrupt Service Routine
(ISR). The vector is fetched in parallel to the state saving, which enables efficient interrupt entry.
The processor supports tail-chaining, which enables back-to-back interrupts to be performed without
the overhead of state saving and restoration. Software can set eight priority levels on 7 exceptions
(system handlers) and 25 interrupts.
“Interrupts” on page 48 provides an overview of the NVIC controller and the interrupt map. Exceptions
and interrupts are detailed in the ARM® Cortex™-M3 Technical Reference Manual.
1.4.2
Motor Control Peripherals
To enhance motor control, the LM3S8630 controller features Pulse Width Modulation (PWM) outputs.
April 04, 2010
34
Texas Instruments-Production Data
Architectural Overview


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