Communication Processor Module
16-74
MPC823e REFERENCE MANUAL
MOTOROLA
TIMERS
COMMUNICATION
16
PROCESSOR MODULE
16.4 TIMERS
The communication processor module includes four identical 16-bit general-purpose timers
that can be cascaded into two 32-bit timers. Each general-purpose timer consists of a timer
mode register, a timer capture register, a timer counter, a timer reference register, a timer
event register, and a timer global configuration register. The timer mode register contains
the prescaler value that you program. The timer block diagram is illustrated in Figure 16-34.
16.4.1 Features
The following list summarizes the main features of the timers:
• Maximum period of 10.7 seconds (at 25MHz)
• Minimum 40ns resolution (at 25MHz)
• Programmable sources for the clock input
• Input capture capability
• Output compare with programmable mode for the output pin
• Four timers can be internally or externally cascaded to form two 32-bit timers. Timer 1
exclusive-Or’ed with SPKR
input from PCMCIA to generate SPKROUT
• Free run and restart modes
Figure 16-34. Timer Block Diagram
TIMER
CLOCK
GENERATOR
CAPTURE
DETECTION
EVENT REGISTER
MODE REGISTER
MODE BITSPRESCALER
TIMER COUNTER
CAPTURE REGISTER
REFERENCE REGISTER
DIVIDER
CLOCK
TER1
TMR1
TCN1
TRR1
TCR1
TIN1
TOUT1
TIMER1
TIMER2
GLOBAL CONFIGURATION REGISTER
TGCR
TIN2
TOUT2
GENERAL SYSTEM CLOCK
CPM LOCAL BUS
TIN3
TIN4
TIMER3
TIMER4
TGATE1
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