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| 型號： | GPTRM |
| 英文描述： | General-Purpose Timer Reference Manual |
| 中文描述： | 通用定時器參考手冊 |
| 文件頁數(shù)： | 16/90頁 |
| 文件大?。?/td> | 647K |
| 代理商： | GPTRM |
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MOTOROLA
1-4
FUNCTIONAL OVERVIEW
GPT
REFERENCE MANUAL
1.2 Input Capture (IC) Concepts
An input capture function has three basic parts: edge select logic, an input capture
latch, and a 16-bit free-running counter. The edge select logic determines the type of
input transition to which the circuit responds. When an input transition occurs, an input
capture function latches the contents of the counter into the input capture latch. This
action sets a status flag indicating that an input capture has occurred. An interrupt is
generated if enabled. The value of the count latched or “captured” is the time of the
event. Because this value is stored in the input capture register when the actual event
occurs, user software can respond to this event at a later time and determine the ac-
tual time of the event. However, this must be done prior to another input capture on
the same pin; otherwise, the previous time value will be lost. Refer to
Figure 1-2
.
Figure 1-2 Input Capture Simplified Block Diagram
By recording the times for successive edges on an incoming signal, software can de-
termine the period and/or pulse width of the signal. To measure a period, two succes-
sive edges of the same polarity are captured. To measure a pulse width, two alternate
polarity edges are captured. For example, to measure the high time of a pulse, the in-
put transition is captured at the rising edge and subtracted from the time captured for
the subsequent falling edge. When the period or pulse width is less than a full 16-bit
counter overflow period, the measurement is very straightforward. In practice, howev-
er, software usually must track the overflows of the 16-bit counter to extend its range.
Another use for the input capture function is to establish a time reference. In this case,
an input capture function is used in conjunction with an output compare function. For
example, if the user wishes to activate an output signal a specific number of clock cy-
cles after detecting an input event (edge), the input capture function is used to record
the time at which the edge occurred. A number corresponding to the desired delay is
added to this captured value and stored to an output compare register. Because both
input captures and output compares are referenced to the same 16-bit counter, the de-
lay can be controlled to the resolution of the free-running counter independent of soft-
ware latencies.
16-BIT FREE-RUNNING
COUNTER
INPUT CAPTURE LATCH
CLOCK
EVENT
DATA BUS
EDGE SELECT
LOGIC
SELECTED
EDGE
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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