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| 型號(hào)： | 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)： | 24/40頁 |
| 文件大?。?/td> | 741K |
| 代理商： | AN2933 |
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Understanding the eTPU Channel Hardware, Rev. 0
Channel Modes
Freescale Semiconductor
24
3.8
Either Match, Blocking, Double Transition
In the
EitherMatchNonBlockingDoubleTransition()
(em_b_dt) mode, each transition will block its
corresponding match, and only the first match and second transition will request service. The matches
block each other as in the em_b_st mode, so that any MRL set indicates a time-out on the corresponding
transition. An MRL before the first transition will capture both TCRs and request service, but subsequent
transitions may overwrite the corresponding capture registers. Match B after the first transition will set
MRLB and capture the TCR in Action Unit B. A subsequent Transition B will capture the selected TCR
at the later time. If Transition A is followed by Transition B without a match, both MRLs will be blocked
and the TCRs will be captured on both edges.
The only difference between this mode and em_nb_dt is the mutual blocking of the matches. If Action Unit
A and Action Unit B are comparing to different TCRs, the MRL that is set will unambiguously indicate
which match (time-out) occurred first.
3.9
Match B, Single Transition
In the
Match2SingleTransition()
(m2_st) mode, transitions are initially blocked. Transition A is enabled
by Match A. If Match B occurs before Match A, it blocks Match A and the transitions and it requests
service. Otherwise, Transition A can be detected and will capture the TCRs in both action units, block a
subsequent MatchB, and request service. Transition B can be detected after Transition A; it will update the
capture of the TCR in Action Unit B, but will not issue a service request.
In an output function, this mode can drive a pin from Match A on the condition that a match on Match B
has not occurred. For example a fuel injector may be set to open at a given angle under the condition that
a time-out has not expired, which might indicate that the engine has stalled.
In an input function, Transition A is expected to occur between Match A and Match B. If that happens,
Match B is blocked, the transition is serviced, and the next transition can be setup. If the transition occurs
before Match A, it will not be detected. Then, when Match B occurs, the error can be detected by the fact
that MRLA is set. If Match B occurs and MRLA is not set, then Match B preceded Match A and no
transitions can be detected. Transition B, if set up, can occur after any Transition A. It will set the TDLB,
but not initiate a service request.
Example 6.
The
Match2SingleTransition()
mode may be used in an application where a
string of regular input pulses is expected and the edges of the pulses could
be characterized by noise too slow to be filtered out by the pin filters. For
example, if the application is tracking a toothed wheel on a rotating shaft
with a variable reluctance sensor, the sensing circuit may operate well at
moderate to fast shaft speeds but exhibit hashy edges when the rotation is
slow, due to the low signal level from the VR sensor.
A driver interfaced to such a system might detect and process the first
transition of the pin input signal, but because of the speed of the eTPU,
continuing noise on the input pin might be interpreted as a subsequent tooth
edge. To reject this noise, the software could setup a match time after the
first edge is detected during which subsequent transitions are ignored. This
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