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): 30/164頁
文件大?。?/td> 1148K
代理商: CTMRM
MOTOROLA
1-10
CTM
REFERENCE
FUNCTIONAL OVERVIEW
For More Information On This Product,
Go to: www.freescale.com
1
Typically, PWM systems are provided with increased flexibility via additional features such as
output polarity selection, variable resolution and variable pulse periods.
1.10
Using and clearing flag bits
To clear any flag bit in the CTM, the software must first read the register containing the flag in
question (usually the SIC register), then write a zero to the flag bit. These two steps do not have
to be done on consecutive instructions. Writing a one to the flag bit has no effect.
Note:
The flag clearing mechanism will work only if no flag setting event occurs between the
read and write operations; if a flag setting event occurs between the read and write
operations, the flag bit will not be cleared.
Figure 1-9
Simplified block diagram of a typical 16-bit PWM system
16-bit pulse width register
16-bit comparator
Output compare register
Output
LatchR
S
Zero
detector
Clock
F
.
Freescale Semiconductor, Inc.
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