參數(shù)資料
型號(hào): GPTRM
英文描述: General-Purpose Timer Reference Manual
中文描述: 通用定時(shí)器參考手冊(cè)
文件頁(yè)數(shù): 60/90頁(yè)
文件大?。?/td> 647K
代理商: GPTRM
MOTOROLA
10-2
APPLICATIONS AND EXAMPLES
GPT
REFERENCE MANUAL
An unused function pin can be used as a general-purpose output to select the motor
direction.
Figure 10-1 Motor Control Example
10.2 Engine Spark and Fuel Timing
A second application would be the use of timing sensors on an engine control system.
A camshaft sensor gives engine cycle information, and a crankshaft sensor gives
crankshaft position. The camshaft is coupled to the crankshaft and rotates at half the
rate of the crankshaft. Piston number one top dead center (TDC) on the power stroke
is indicated by an output pulse occurring from both sensors at the same time.
Both the camshaft and crankshaft sensor outputs are connected to an input capture
pin. When an input capture occurs on both of these channels simultaneously, both will
have the same input capture value. This gives an absolute timing reference for deter-
mining fuel injection and spark timing. In the above example, the crankshaft is also
connected to the pulse accumulator input (PAI) pin.
The PAI pin can be used to count the number of teeth after the timing reference. If the
pulse accumulator counter (PACNT) is loaded with $F7 (247 decimal), the counter will
roll over after the ninth tooth is counted. If the crankshaft timing gear has 36 teeth, the
ninth tooth represents TDC of the next piston on a four-cylinder engine. Eighteen teeth
represents the next TDC, and 27 teeth the last piston in the firing order.
FEEDBACK
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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