LM3S3748 Datasheet, PDF (297/753 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S3748 Microcontroller
11
11.1
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 four GPTM blocks (Timer0, Timer1,
Timer 2, and Timer 3). 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). Timers can also be
used to trigger analog-to-digital (ADC) conversions. The trigger signals from all of the general-purpose
timers are ORed together before reaching the ADC module, so only one timer should be used to
trigger ADC events.
The General-Purpose Timer Module is one timing resource available on the Stellaris^® microcontrollers.
Other timer resources include the System Timer (SysTick) (see “System Timer (SysTick)” on page 45)
and the PWM timer in the PWM module (see “PWM Timer” on page 604).
The following modes are supported:
■ 32-bit Timer modes
– Programmable one-shot timer
– Programmable periodic timer
– Real-Time Clock using 32.768-KHz input clock
– Software-controlled event stalling (excluding RTC mode)
■ 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
– Software-controlled event stalling
■ 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
Block Diagram
Note: In Figure 11-1 on page 298, the specific CCP pins available depend on the Stellaris^® device.
See Table 11-1 on page 298 for the available CCPs.
April 08, 2008
297
Preliminary