MSC8144E Reference Manual, Rev. 3
Freescale Semiconductor
21-1
Timers
21
The MSC8144E device includes 3 types of timers:
Device-level timers. Each MSC8144E device contains a total of 16 device timers. Each
can be used by any of the DSP cores within MSC8144E as well as by an external host. See
Section 21.1 for details.
SC3400 DSP core platform timers. Each of the SC3400 DSP core subsystems contain two
timers used by the specific DSP core for any required operating system purpose. For
details, see the MSC8144 DSP Core Subsystem Reference Manual available with a signed
non-disclosure agreement. Contact you Freescale representative or distributor for details.
Software watchdog timers. The MSC8144E device includes 5 software watchdog timers.
Each of the software watchdog timers can be used by any of the cores within MSC8144E
as well as by an external host. For details, see Section 21.3.
21.1 Device-Level Timers
There are four identical quad timer modules in the MSC8144E device. Each quad timer module
contains four identical timer groups that serve as frequency dividers, clock generators, and event
counters. Each 16-bit timer group contains a prescaler, a counter, a load register, a hold register, a
capture register, two compare registers, and two status and control registers. The timers interface
with the MSC8144E inputs/outputs as listed in Table 21-1. This document uses the term timer to
refer to the four internal timers in each module and quad timer to refer to each of the timer
modules. The term channel is used in register naming for clarity.
Table 21-1. Device-Level Timers Connectivity
Timer Module
Timer Channel
External Input
External Output
0
0
TIMER0
—
1
TIMER1
TIMER0
2
CLKIN
—
3
TDM0TCLK
TIMER1
1
0
TIMER0
—
1
TIMER2
—
2
CLKIN
—
3
TDM0TCLK
TIMER2
2
0
TIMER0
—
1
TIMER3
—
2
CLKIN
—
3
TDM0TCLK
TIMER3
Содержание MSC8144E
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