參數(shù)資料
型號： DRM011
英文描述： Direct Current Ignition Reference Design Designer Reference Manual
中文描述： 直流點火參考設計設計參考手冊
文件頁數(shù)： 29/72頁
文件大?。?/td> 1177K
代理商： DRM011
Vacuum Cleaner Reference Design
Input Capture
DRM010 — Rev 0
Designer Reference Manual
MOTOROLA
Vacuum Cleaner Reference Design
For More Information On This Product,
Go to: www.freescale.com
29
Once the MCU is initialized, the main loop may be interrupted by the
input capture and the output compare interrupt service routines.
Figure 1-11. Software Flow Diagram
1.7 Input Capture
The input capture interrupt service routine is executed every time the
input capture timer channel detects an edge on the zero crossing input.
The input capture time is read from the timer channel. The average
period is calculated over two cycles. This value is used as criteria for
locking on the input line frequency. The minimum and maximum periods
are set up to lock from 30 Hz to 90 Hz. This will accommodate both 50-
and 60-Hz possibilities and up to 50 percent error in the clock frequency.
START
INITIALIZE
IS SYNC = 1
NO
YES
SET SYNC = 0
INTERRUPT
INTERRUPT
InputCapture
SCHEDULES
TRIAC PULSE
SET SYNC = 1
OutputCompare
GENERATES
TRIAC
PULSE
ControlLoop
F
Freescale Semiconductor, Inc.
n
.
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