Freescale Semiconductor DSP56366 11 Timer/ Event Counter

DSP56366 24-Bit Digital Signal Processor User Manual, Rev. 4
Freescale Semiconductor 11-1
11 Timer/ Event Counter
11.1 Introduction
This section describes the internal timer/event counter in the DSP56366. Each of the three timers (timer 0,
1 and 2) can use internal clocking to interrupt the DSP56366 or trigger DMA transfers after a specified
number of events (clocks). In addition, timer 0 provides external access via the bidirectional signal TIO0.
When the TIO0 pin is configured as an input, timer 0 can count or capture events, or measure the width or
period of an external signal. When TIO0 is configured as an output, timer 0 can function as a timer, a
watchdog timer, or a pulse width modulator. TIO0 can also function as a GPIO signal.
11.2 Timer/Event Counter Architecture
The timer module is composed of a common 21-bit prescaler and three independent general purpose 24-bit
timer/event counters, each having its own register set.
11.2.1 Timer/Event Counter Block Diagram
Figure 11-1 shows a block diagram of the timer/event counter. This module includes a 24-bit timer
prescaler load register (TPLR), a 24-bit timer prescaler count register (TPCR), a 21-bit prescaler clock
counter, and three timers. Each of the three timers may use the prescaler clock as its clock source.