LM3S300-IQN25-C2 Datasheet, PDF (262/498 Pages) Texas Instruments – Stellaris LM3S300 Microcontroller

General-Purpose Timers
NRND: Not recommended for new designs.
8 General-Purpose Timers
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 (Timer0, Timer1,
and Timer 2). Each GPTM block provides two 16-bit timers/counters (referred to as TimerA and
TimerB) 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).
The GPT Module is one timing resource available on the Stellaris microcontrollers. Other timer
resources include the System Timer (SysTick) (see 82).
The General-Purpose Timers provide the following features:
■ Three General-Purpose Timer Modules (GPTM), each of which provides two 16-bit
timers/counters. Each GPTM can be configured to operate independently:
– As a single 32-bit timer
– As one 32-bit Real-Time Clock (RTC) to event capture
– For Pulse Width Modulation (PWM)
■ 32-bit Timer modes
– Programmable one-shot timer
– Programmable periodic timer
– Real-Time Clock when using an external 32.768-KHz clock as the input
– User-enabled stalling when the controller asserts CPU Halt flag during debug
■ 16-bit Timer modes
– General-purpose timer function with an 8-bit prescaler (for one-shot and periodic modes only)
– Programmable one-shot timer
– Programmable periodic timer
– User-enabled stalling when the controller asserts CPU Halt flag during debug
■ 16-bit Input Capture modes
– Input edge count capture
– Input edge time capture
■ 16-bit PWM mode
– Simple PWM mode with software-programmable output inversion of the PWM signal
8.1 Block Diagram
Note: In Figure 8-1 on page 263, the specific CCP pins available depend on the Stellaris device.
See Table 8-1 on page 263 for the available CCPs.
262
June 18, 2012
Texas Instruments-Production Data