參數(shù)資料
型號: CTMRM
英文描述: Configurable Timer Module Reference Manual
中文描述: 配置定時(shí)器模塊參考手冊
文件頁數(shù): 27/164頁
文件大?。?/td> 1148K
代理商: CTMRM
CTM
REFERENCE
MOTOROLA
1-7
FUNCTIONAL OVERVIEW
For More Information On This Product,
Go to: www.freescale.com
1
1.7
Output compare (OC) concepts
Output compare functions are used to cause events to occur at specific times, i.e. to cause signal
transitions to occur on an output pin. A typical 16-bit output compare function is shown in
Figure 1-6; it comprises a 16-bit compare register, a 16-bit comparator and a 16-bit free-running
counter. When the value stored in the compare register matches the value of the free-running
counter, the comparator sets an output compare flag.
Other events can occur when the output compare flag is set: an interrupt may be generated (if
interrupts are enabled) and the logic levels on pins associated with the output compare function
may change.
The output compare function can generate an output of a specific duration and polarity. A 16-bit
value corresponding to the time a when a pin state change will occur is written to the output
Figure 1-5
Simplified block diagram of 16-bit input capture
Figure 1-6
Simplified block diagram of 16-bit output compare
16-bit free-running
counter
Input capture latch
Edge select
logic
Clock
Data bus
Event
16-bit free running
counter
16-bit comparator
Clock
16-bit output compare
register
Output match
=
F
.
Freescale Semiconductor, Inc.
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