參數(shù)資料
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): 32/90頁
文件大?。?/td> 647K
代理商: GPTRM
MOTOROLA
3-10
COMPARE/CAPTURE UNIT
GPT
REFERENCE MANUAL
FPWMx — Force PWM Value
0 = PWM pin x is used for PWM functions; normal operation.
1 = PWM pin x is used for discrete output.
For more information on the FPWMA and FPWMB bits refer to
SECTION 6 PULSE-
WIDTH MODULATION UNIT
.
3.4 Input Capture 4/Output Compare 5 (IC4/OC5)
The input capture 4/output compare 5 pin has multiple functions. As discussed in the
previous sections, this pin can be used as an input capture pin, an output compare pin
or as a general-purpose I/O pin. These features are controlled by the DDRI4/O5 bit in
the parallel data direction register (PDDR) and a function enable bit I4/O5 in the pulse
accumulator control register (PACTL). The function enable bit configures the pin for
the input capture (IC4) or output compare function (OC5). After reset both bits are
cleared to zero configuring the pin as an input, but also enabling the OC5 function.
When the OC5 function is programmed to produce an output on the IC4/OC5 pin
(OM5:OL5 bits non-zero in TCTL1), DDRI4/O5 in the PDDR is overridden. In all other
aspects, OC5 works the same as the other output compare functions.
This pin is configured as input capture function 4 (IC4) if the function enable bit I4/O5
of the PACTL register is set to one. If DDRI4/O5 is set to one (pin configured as an
output) and IC4 is enabled, writes to the pin can cause an input capture event if the
proper edge is selected. Except as noted, IC4 works the same as the other input cap-
ture functions.
The 16-bit register used with the IC4/OC5 function acts as either the input capture reg-
ister or as the output compare register depending on which function is selected. When
used as the input capture 4 register, it cannot be written to except in test or freeze
mode. Refer to
SECTION 9 SPECIAL MODES
for information on freeze and test
mode.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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