參數(shù)資料
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): 17/90頁
文件大?。?/td> 647K
代理商: GPTRM
GPT
REFERENCE MANUAL
FUNCTIONAL OVERVIEW
MOTOROLA
1-5
1.3 Output Compare (OC) Concepts
A 16-bit free-running counter provides the timing reference for output compares. Out-
put compare functions are used to program a specific time an event occurs. An output
compare function has a dedicated 16-bit compare register and a 16-bit comparator.
When the contents of the compare register match the value of the free-running
counter, the comparator sets an output compare flag. Refer to
Figure 1-3
.
Other events can occur when the flag is set. An interrupt can be generated if enabled.
State changes can optionally occur on pins associated with the output compare func-
tion.
Figure 1-3 Output Compare Simplified Block Diagram
The output compare function can generate an output of a specific duration and polar-
ity. A 16-bit value corresponding to the time a pin state change will occur is written to
the output compare register. The output compare function is configured to automati-
cally generate a high or low output on the pin or toggle its state when the match occurs.
The output compare register is reprogrammed to a new value after the compare oc-
curs. When the next match takes place, the pin returns to the previous state. The new
value corresponds to the time the next compare occurs. Because pin state changes
occur automatically at specific values of the free-running counter, the pulse width can
be controlled to the resolution of the free-running counter independent of software la-
tencies. A periodic pulse of a specific frequency and duty cycle can be generated by
repeating the above steps.
1.4 Pulse Accumulator Input (PAI) Concepts
The pulse accumulator contains an 8-bit counter and edge select logic. The pulse ac-
cumulator has two modes of operation: event counting and gated mode. In event
counting mode, an 8-bit counter is incremented when an event occurs. In gated mode
an internal clock source increments the 8-bit counter while a selected level is present
16-BIT FREE-RUNNING
COUNTER
16-BIT COMPARATOR
16-BIT OUTPUT COMPARE
REGISTER
OUTPUT MATCH
CLOCK
=
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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