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PRESCALER |
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DIVIDE BY |
TCNT (HI) TCNT (LO) |
TOI |
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MCU |
1, 4, 8, OR 16 |
16-BIT FREE RUNNING |
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PR1 |
PR0 |
TOF |
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E CLK |
COUNTER |
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TAPS FOR RTI, |
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INTERRUPT REQUESTS |
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COP WATCHDOG, AND |
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(FURTHER QUALIFIED BY |
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PULSE ACCUMULATOR |
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16-BIT TIMER BUS |
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I BIT IN CCR) |
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TO PULSE |
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ACCUMULATOR |
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OC1I |
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PIN |
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FUNCTIONS |
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16-BIT COMPARATOR = |
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OC1F |
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PA7/OC1/ |
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TOC1 |
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FOC1 |
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BIT 7 |
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PAI |
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OC2I |
7 |
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16-BIT COMPARATOR = |
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OC2F |
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PA6/OC2/ |
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TOC2 |
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TOC2 |
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BIT 6 |
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FOC2 |
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OC1 |
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OC3I |
6 |
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16-BIT COMPARATOR = |
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OC3F |
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PA5/OC3/ |
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TOC3 |
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BIT 5 |
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FOC3 |
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OC1 |
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OC4I |
5 |
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16-BIT COMPARATOR = |
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OC4F |
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PA4/OC4/ |
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TOC4 |
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TOC4 |
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BIT 4 |
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FOC4 |
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OC1 |
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I4/O5I |
4 |
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OC5 |
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16-BIT COMPARATOR = |
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PA3/OC5/ |
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TI4/O5 (HI) |
TI4/O5 |
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I4/O5F |
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BIT 3 |
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FOC5 |
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IC4/OC1 |
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16-BIT LATCH |
CLK |
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IC4 |
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CFORC |
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I4/O5 |
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FORCE OUTPUT |
IC1I |
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COMPARE |
3 |
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16-BIT LATCH |
CLK |
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IC1F |
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BIT 2 |
PA2/IC1 |
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TIC1 |
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TIC1 |
(LO) |
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IC2I |
2 |
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16-BIT LATCH |
CLK |
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IC2F |
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BIT 1 |
PA1/IC2 |
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TIC2 |
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TIC2 |
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IC3I |
1 |
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16-BIT LATCH |
CLK |
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IC3F |
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BIT 0 |
PA0/IC3 |
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TIC3 |
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TIC3 |
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TFLG 1 |
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TMSK 1 |
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PORT A |
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STATUS |
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INTERRUPT |
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PIN CONTROL |
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FLAGS |
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ENABLES |
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CAPTURE COMPARE BLOCK |
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Figure 9-2 Capture/Compare Block Diagram
9.2 Input Capture
The input capture function records the time an external event occurs by latching the value of the free-running counter when a selected edge is detected at the associated timer input pin. Software can store latched values and use them to compute the periodicity and duration of events. For example, by storing the times of successive edges of an incoming signal, software can determine the period and pulse width of a signal.
MOTOROLA |
TIMING SYSTEM |
M68HC11 E SERIES |
9-4 |
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TECHNICAL DATA |