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| 型號： | GPTRM |
| 英文描述： | General-Purpose Timer Reference Manual |
| 中文描述： | 通用定時器參考手冊 |
| 文件頁數(shù)： | 22/90頁 |
| 文件大小： | 647K |
| 代理商： | GPTRM |
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MOTOROLA
2-2
SIGNAL DESCRIPTIONS
GPT
REFERENCE MANUAL
2.3 Input Capture/Output Compare Pin (IC4/OC5)
This pin can be configured to be an input capture or an output compare function. It has
one 16-bit register which is used for holding either the input capture value or the output
match value. When used as an input, the signal is conditioned in such a way that any
pulse longer than two system clocks is guaranteed to pass, and any pulse shorter than
one system clock is ignored. If this pin is not needed for either the input capture or out-
put compare function, it can be used for general-purpose I/O. Refer to
ture Functions
and
3.3 Output Compare Functions
operation of these functions.
3.2 Input Cap-
for additional details on the
2.4 Output Compare Pins (OC1–OC4)
These pins are used for the output compare functions of the GPT and operate inde-
pendently of each other. There is a dedicated 16-bit compare register and 16-bit com-
parator for each pin. Pins OC2, OC3, and OC4 are associated with a specific output
compare function; whereas, the OC1 function can affect the output of any combination
of output compare pins. Automatic preprogrammed pin actions occur on a successful
match. The programmable pin actions differ between OC2–OC5 and OC1. If the OC1
pin is not needed for the output compare function, it can be used to output the clock
selected for the timer counter register (TCNT). Any of the pins can be used for general-
purpose I/O if not needed for the output compare function. For additional details on the
operation of the output compare function refer to
Refer to
5.1 Prescaler
for details on this submodule.
3.3 Output Compare Functions
.
2.5 Pulse Accumulator Input Pin (PAI)
The PAI pin is the signal input to the pulse accumulator. If not needed for this function,
it can be used as a general-purpose input pin. The signal is conditioned in such a way
that any pulse longer than two system clocks is guaranteed to pass, and any pulse
shorter than one system clock is ignored. Any pulse shorter than one system clock is
filtered out. For more details on the pulse accumulator function, refer to
cumulator
.
4.1 Pulse Ac-
2.6 Pulse-Width Modulation (PWMA, PWMB)
The PWMA and PWMB pins are used as outputs for the PWM functions. These out-
puts can be programmed to generate a periodic waveform with a variable frequency
and duty cycle. The pins can be used for general-purpose output if not needed for the
PWM function. PWMA can also be used to output the clock selected as the input to
the PWM counter (PWMCNT). For more details on the PWM functions refer to
TION 6 PULSE-WIDTH MODULATION UNIT
.
SEC-
2.7 Auxiliary Timer Clock Input (PCLK)
PCLK is an external clock input which is dedicated to the GPT. The signal is condi-
tioned in such a way that any pulse longer than two system clocks is guaranteed to
pass, and any pulse shorter than one system clock is ignored. PCLK can be used as
the clock source for the capture/compare unit or the PWM unit in place of one of the
prescaler outputs. If this pin is not used as a clock input, it can be used as a general-
purpose input pin. See
5.1 Prescaler
and
8.1.1 Uni-Directional I/O
for additional in-
formation on PCLK.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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