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LM3S1651 Datasheet, PDF (51/1033 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark | |||
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Stellaris® LM3S1651 Microcontroller
1.3.4.3
1.3.4.4
â MOSC failure
Programmable Timers (see page 461)
Programmable timers can be used to count or time external events that drive the Timer input pins.
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). Timers can also be used to trigger analog-to-digital (ADC) conversions.
The General-Purpose Timer Module (GPTM) contains four GPTM blocks with the following functional
options:
â Operating modes:
â 16- or 32-bit programmable one-shot timer
â 16- or 32-bit programmable periodic timer
â 16-bit general-purpose timer with an 8-bit prescaler
â 32-bit Real-Time Clock (RTC) when using an external 32.768-KHz clock as the input
â 16-bit input-edge count- or time-capture modes
â 16-bit PWM mode with software-programmable output inversion of the PWM signal
â Count up or down
â Eight Capture Compare PWM pins (CCP)
â Daisy chaining of timer modules to allow a single timer to initiate multiple timing events
â ADC event trigger
â User-enabled stalling when the microcontroller asserts CPU Halt flag during debug (excluding
RTC mode)
â Ability to determine the elapsed time between the assertion of the timer interrupt and entry into
the interrupt service routine.
â Efficient transfers using Micro Direct Memory Access Controller (µDMA)
â Dedicated channel for each timer
â Burst request generated on timer interrupt
CCP Pins (see page 469)
Capture Compare PWM pins (CCP) can be used by the General-Purpose Timer Module to time/count
external events using the CCP pin as an input. Alternatively, the GPTM can generate a simple PWM
output on the CCP pin.
The LM3S1651 microcontroller includes eight Capture Compare PWM pins (CCP) that can be
programmed to operate in the following modes:
â Capture: The GP Timer is incremented/decremented by programmed events on the CCP input.
The GP Timer captures and stores the current timer value when a programmed event occurs.
January 21, 2012
51
Texas Instruments-Production Data
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