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Chapter 26
General-Purpose Timers
The MC9328MX1 contains two identical general-purpose 32-bit timers with programmable prescalers and
compare and capture registers. Each timer counter value can be captured using an external event and can
be configured to trigger a capture event on either the leading or trailing edges of an input pulse. The timer
can also generate an interrupt when the timer reaches a programmed value. Each timer has an 8-bit
prescaler providing a programmable clock frequency derived from PERCLK1. Figure 26-1 illustrates the
general-purpose timers block diagram.
PERCLK1
÷ 16
PERCLK1
CLK32
TIN
TIN
TIN
CLK32
PERCLK1
PERCLK1
÷ 16
The timers have the following features:
•
Maximum period of 512
•
10 ns resolution at 100 MHz
•
Programmable sources for the clock input, including external clock
•
Input capture capability with programmable trigger edge
•
Output compare with programmable mode
•
Free-run and restart modes
•
Software reset function
MOTOROLA
PCLK
Prescaler1
Capture
Logic
Capture
Logic
PCLK
Prescaler2
Figure 26-1. General-Purpose Timers Block Diagram
×
65536 seconds at 32.768 kHz or 436
General-Purpose Timers
1 Compare
1 Counter
1 Capture
1 Control
1 Status
2 Status
2 Control
2 Capture
2 Counter
2 Compare
×
65536 seconds at 38.4 kHz
TIMER1_INT
Output
Logic
MPU Bus
MPU Bus
TMR2OUT
Output
Logic
TIMER2_INT
26-1
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