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參數(shù)資料
| 型號： | AN2933 |
| 英文描述： | Understanding the eTPU Channel Hardware |
| 中文描述： | 理解硬件頻道的eTPU |
| 文件頁數(shù)： | 7/40頁 |
| 文件大?。?/td> | 741K |
| 代理商： | AN2933 |
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Architecture of the eTPU Channel
Understanding the eTPU Channel Hardware, Rev. 0
Freescale Semiconductor
7
2.3
Pin Interface
NOTE
The term “pin” usually modified here with “input” or “output,” refers to the
interconnection point between the eTPU module and the rest of the MCU
silicon. These pins may or may not be connected to the MCU I/O pins. They
may be tied together at the MCU pin, or they may be chain connected such
that eTPU input for channel X is tied to the eTPU output for channel Y and
so on. The examples and information presented herein does not make any
assumption about the MCU interconnection. See the product information
for eTPU pin interconnection for a specific device.
There are separate controls on the input and output pins of each channel, therefore there is no data direction
control in the eTPU instruction set. Input instructions control the input pin and output instructions control
the output pin. If a match drives an output pin and that pin is interconnected to an input pin of the same or
different channel, the input logic can detect the match drive as a transition.
2.3.1
Output Pin Action
The eTPU channel can drive the output pin by software command or by channel action according to the
Output Pin Action Control (OPAC). The most common way to drive the pin is by satisfying a match
register comparison in the comparator of one of the action units. The output pin action that occurs as a
result of a match is determined by a software write to a register as defined in
Table 2
.
Mtcr2_Ctcr2_ge
TimeBaseAMatchTcr2CaptureTcr2GreaterEqual()
TimeBaseBMatchTcr2CaptureTcr2GreaterEqual()
Capture TCR2 and
greater_or_equal compare
to TCR2 for this action unit
Mtcr1_Ctcr1_eq
TimeBaseAMatchTcr1CaptureTcr1ExactlyEqual()
TimeBaseBMatchTcr1CaptureTcr1ExactlyEqual()
Capture TCR1 and
exactly_equal compare to
TCR1 for this action unit
Mtcr2_Ctcr1_eq
TimeBaseAMatchTcr2CaptureTcr1ExactlyEqual()
TimeBaseBMatchTcr2CaptureTcr1ExactlyEqual()
Capture TCR1 and
exactly_equal compare to
TCR2 for this action unit
Mtcr1_Ctcr2_eq
TimeBaseAMatchTcr1CaptureTcr2ExactlyEqual()
TimeBaseBMatchTcr1CaptureTcr2ExactlyEqual()
Capture TCR2 and
exactly_equal compare to
TCR1 for this action unit
Mtcr2_Ctcr2_eq
TimeBaseAMatchTcr2CaptureTcr2ExactlyEqual()
TimeBaseBMatchTcr2CaptureTcr2ExactlyEqual()
Capture TCR2 and
exactly_equal compare to
TCR2 for this action unit
Table 1. Action Unit Time Base Select (continued)
TBSA/TBSA
Macro
Action
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