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Enhanced Modular Input/Output Subsystem (eMIOS)
MPC5566 Microcontroller Reference Manual, Rev. 2
17-64
Freescale Semiconductor
shows the operation of the output disable feature in OPWFMB mode. Unlike OPWFM mode,
the output disable forces the channel output flip-flop to the EDPOL bit value. This functionality targets
applications that use active high signals and a high to low transition at A1 match. For such cases, clear
EDPOL to 0.
Figure 17-47. eMIOS OPWFMB Mode Example — Active Output Disable
The output disable has a synchronous operation, meaning that the assertion of the output disable input
signal causes the channel output flip-flop to transition to EDPOL at the next system clock cycle. If the
output disable input is negated, the output flip-flop transitions at the following A1 or B1 match.
it is assumed that the output disable input is enabled and selected for the channel (refer to
Section 17.3.1.7, “eMIOS Channel Control Register (EMIOS_CCRn),”
for a detailed description of the
ODIS and ODISSL bits and selection of the output disable inputs).
The FORCMA and FORCMB bits allow the software to force the output flip-flop to the level
corresponding to a match on comparators A or B respectively. Similar to a B1 match, FORCMB clears the
internal counter. The FLAG bit is not set when the FORCMA or FORCMB bits are set.
Cycle n
Cycle n+1
Cycle n+2
A1 value
B1 value
B2 value
0x000008
0x000002
0x000006
0x000008
0x000001
EMIOS_CCNTR
n
0x000004
0x000006
MODE[0] = 1
A2 value
0x000002
0x000004
0x000006
0x000002
0x000004
0x000006
0x000008
0x000006
Output flip-flop
Write to B2
Match A1
Match B1
Match B1
A1/B1 load signal
Due to B1 match
FLAG set event
cycle n-1
Time
Write to A2
Match A1
Write to A2
Match B1
EDPOL = 0
Содержание MPC5566
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