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): 26/90頁(yè)
文件大?。?/td> 647K
代理商: GPTRM
MOTOROLA
3-4
COMPARE/CAPTURE UNIT
GPT
REFERENCE MANUAL
Figure 3-2 Input Capture Timing Example
Because the input capture register is a 16-bit register, a word access is required to en-
sure coherency. If this is not required, each byte can be accessed independently using
byte accesses. The input capture registers can be read at any time without affecting
their values.
An input capture occurs every time a selected edge is detected, even if the input cap-
ture flag is already set. This means that the value read from the input capture register
corresponds to the most recent edge at the pin, which may not be the edge that
caused the input capture flag to be set.
If any of the pins IC[1:3] are not needed for an input capture function, they can be used
as general-purpose input/output. The data direction of the pin is determined by the
state of bits in the data direction register (DDR). For more information on general-pur-
pose I/O refer to
8.1 General-Purpose I/O
.
3.2.1 Input Capture Registers (TIC1–3)
The input capture registers are 16-bit read-only registers which are used to latch the
value of TCNT when a specified transition is detected on the corresponding input cap-
ture pin. Reads of these registers should be word accesses to ensure coherency. They
are reset to $FFFF. Refer to
Figure 3-3
.
CAPTURE/COMPARE
CLOCK
CAPTURE REGISTER
$0102
SYNCHRONIZER
OUTPUT
ICxF FLAG
EXTERNAL PIN
TCNT
$0102
$0101
F
clock
(PHI1)
*
*
PHI1 is the same frequency as the system clock; however, it does not have the same timing.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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