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LM3S8530-IQR80-C1

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型号: LM3S8530-IQR80-C1
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  • LM3S8530-IQR80-C1 PDF文件
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功能描述: Stellaris® LM3S8530 Microcontroller
PDF文件大小: 4249.13 Kbytes
PDF页数: 共526页
制造商: TI[Texas Instruments]
制造商LOGO: TI[Texas Instruments] LOGO
制造商网址: http://www.ti.com
捡单宝LM3S8530-IQR80-C1
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120%
The following example shows a variety of configurations for a 16-bit free running timer while using
the prescaler. All values assume a 50-MHz clock with Tc=20 ns (clock period).
Table 9-2. 16-Bit Timer With Prescaler Configurations
UnitsMax Time#Clock (T c)
a
Prescale
mS1.3107100000000
mS2.6214200000001
mS3.9322300000010
------------------
mS332.922925411111101
mS334.233625511111110
mS335.544325611111111
a. Tc is the clock period.
9.2.3.2 16-Bit Input Edge Count Mode
Note: For rising-edge detection, the input signal must be High for at least two system clock periods
following the rising edge. Similarly, for falling-edge detection, the input signal must be Low
for at least two system clock periods following the falling edge. Based on this criteria, the
maximum input frequency for edge detection is 1/4 of the system frequency.
Note: The prescaler is not available in 16-Bit Input Edge Count mode.
In Edge Count mode, the timer is configured as a down-counter capable of capturing three types
of events: rising edge, falling edge, or both. To place the timer in Edge Count mode, the TnCMR bit
of the GPTMTnMR register must be set to 0. The type of edge that the timer counts is determined
by the TnEVENT fields of the GPTMCTL register. During initialization, the GPTM Timern Match
(GPTMTnMATCHR) register is configured so that the difference between the value in the
GPTMTnILR register and the GPTMTnMATCHR register equals the number of edge events that
must be counted.
When software writes the TnEN bit in the GPTM Control (GPTMCTL) register, the timer is enabled
for event capture. Each input event on the CCPpin decrements the counter by 1 until the event count
matches GPTMTnMATCHR. When the counts match, the GPTM asserts the CnMRIS bit in the
GPTMRIS register (and the CnMMIS bit, if the interrupt is not masked).
The counter is then reloaded using the value in GPTMTnILR, and stopped since the GPTM
automatically clears the TnEN bit in the GPTMCTL register. Once the event count has been reached,
all further events are ignored until TnEN is re-enabled by software.
Figure 9-2 on page 195 shows how input edge count mode works. In this case, the timer start value
is set to GPTMnILR =0x000A and the match value is set to GPTMnMATCHR =0x0006 so that four
edge events are counted. The counter is configured to detect both edges of the input signal.
Note that the last two edges are not counted since the timer automatically clears the TnEN bit after
the current count matches the value in the GPTMnMR register.
June 22, 2010194
Texas Instruments-Production Data
General-Purpose Timers
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