參數(shù)資料
型號: CTMRM
英文描述: Configurable Timer Module Reference Manual
中文描述: 配置定時器模塊參考手冊
文件頁數(shù): 79/164頁
文件大?。?/td> 1148K
代理商: CTMRM
CTM
REFERENCE
MOTOROLA
8-9
DOUBLE ACTION SUBMODULE (DASM)
For More Information On This Product,
Go to: www.freescale.com
8
Figure 8-5 provides an example of how the DASM can be used to generate a single output pulse.
8.3.5.2
Single output compare operation
The single output compare operation is selected by writing to only one of the two data registers (A
or B), thus enabling only one of the comparators. Following the first successful match on the
enabled channel, the output level is fixed and remains at the same level indefinitely with no further
software intervention being required.
Note:
In this mode, registers A and B2 are accessible to the user software (at consecutive
addresses).
Figure 8-6 provides an example of how the DASM can be used to perform a single output compare.
8.3.5.3
Output port bit operation
The output port bit operation is selected by leaving both channels disabled, i.e. by writing to neither
register A nor B. The EDPOL bit alone controls the output value.The same result can be achieved
by keeping EDPOL at zero and using the FORCA and FORCB bits to obtain the desired output
level.
Figure 8-5
Single-shot output pulse example
Time base bus
$0500
$1000
$1100
$0000
$1000
$1100
FLAG bit
DASMA value
1
B2 value
1
$xxxx
$1100
$1100
$xxxx
$1000
$1000
Output signal
Mode selection; MODE0 = 0
FLAG reset
by software
A
B
Write to
A and B
1. These values are accessible to the software.
Note:
F
.
Freescale Semiconductor, Inc.
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