NXP Semiconductors MPC5566 - Page 695

Enhanced Modular Input/Output Subsystem (eMIOS)
MPC5566 Microcontroller Reference Manual, Rev. 2
17-16 Freescale Semiconductor
9–12
IF[0:3]
Input filter. Controls the programmable input filter, selecting the minimum input pulse-width that can pass
through the filter, as shown below. For output modes, these bits have no meaning.
13
FCK
Filter clock select. Selects the clock source for the programmable input filter.
0 Prescaled clock
1 Main clock
14
FEN
FLAG enable. Allows the unified channel FLAG bit to generate an interrupt signal or a DMA request signal
(The type of signal to be generated is defined by the DMA bit).
0 Disable (FLAG does not generate an interrupt or DMA request)
1 Enable (FLAG generates an interrupt or DMA request)
15–17 Reserved.
18
FORCMA
Force match A. For output modes, the FORCMA bit is equivalent to a successful comparison on comparator
A (except that the FLAG bit is not set). This bit is cleared by reset and is always read as zero. This bit is valid
for every output operating mode which uses comparator A, otherwise it has no effect.
0 Has no effect
1 Force a match at comparator A
For input modes, the FORCMA bit is not used and writing to it has no effect.
19
FORCMB
Force match B. For output modes, the FORCMB bit is equivalent to a successful comparison on comparator
B (except that the FLAG bit is not set). This bit is cleared by reset and is always read as zero. This bit is valid
for every output operating mode which uses comparator B, otherwise it has no effect.
0 Has no effect
1 Force a match at comparator B
For input modes, the FORCMB bit is not used and writing to it has no effect.
20 Reserved.
Table 17-9. EMIOS_CCRn Field Description (continued)
Field Description
IF[0:3]
1
1
Filter latency is three clock cycles.
Minimum Input Pulse Width
[filter clock periods]
0000 Bypassed
2
2
The input signal is synchronized before arriving at the
digital filter.
0001 2 filter clock periods
0010 4 filter clock periods
0100 8 filter clock periods
1000 16 filter clock periods
all others Invalid values