Motorola DSP56301 - Manual (Page 263)

Triple Timer Module 9 -1
Chapter 9
Triple Timer Module
The timers in the DSP56301 internal triple timer module act as timed pulse generators or as
pulse-width modulators. Each timer has a single signal that can function as a GPIO signal or
as a timer signal. Each timer can also function as an event counter to capture an event or to
measure the width or period of a signal.
9.1 Overview
The timer module contains a common 21-bit prescaler and three independent and identical
general-purpose 24-bit timer/event counters, each with its own register set. Each timer has the
following capabilities:
n Uses internal or external clocking
n Interrupts the DSP56301 after a specified number of events (clocks) or signals an
external device after counting internal events
n Triggers DMA transfers after a specified number of events (clocks) occurs
n Connects to the external world through one bidirectional signal, designated
TIO[0– 2] for timers 0–2.
When TIO is configured as an input, the timer functions as an external event counter or
measures external pulse width/signal period. When TIO is configured as an output, the timer
functions as a timer, a watchdog timer, or a pulse-width modulator. When the timer does not
use
TIO , it can be used as a GPIO signal (also called TIO[0–2]) .