LM3S1958 Datasheet, PDF (189/435 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S1958 Microcontroller
10
General-Purpose Timers
GPTM
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 timer/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.
Note: Timer2 is an internal timer and can only be used to generate internal interrupts or 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 34).
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
June 14, 2007
189
Luminary Micro Confidential-Advance Product Information