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There’s also a glitch filter for these pads that avoids erroneous requests that may be triggered by
noise. Interrupt Filter Enable Register (IFER) can set which pads are to be filtered. And IFMC
and IFCPR are used to set filters parameters. These two registers together have only two fields
MAXCNT[x][3:0] (x: one for each pad) is the Maximum Couter, IFCP[3:0] is the clock prescaler
setting common to all pads. Having these two parameters, we have:
Filter Period[
𝑥
] =
𝑇
𝐶𝐾
× (
𝑀𝐴𝑋𝐶𝑁𝑇
[
𝑥
] +
𝑛
) (
𝑛
is random in [
−
1,3])
𝑇
𝐶𝐾
= (
𝐼𝐹𝐶𝑃
+ 1) ×
𝑇
𝐹𝐼𝑅𝐶
,
𝑓
𝐹𝐼𝑅𝐶
= 16
𝑀𝐻𝑧
If the signal is steady for at least the Filter Period, then the glitch filter triggers the interrupt.
Summary of Contents for MPC5604B
Page 1: ...LAAS CNRS Quick Start to MPC5604B Embedded Development Sahin Serdar 21 06 2013...
Page 31: ...Figure 33 INTC SW HW mode comparison Freescale Tutorial...
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Page 133: ...127 Appendix 2 Pad Configurations...
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Page 141: ...Appendix 3 Peripheral input pin selection...
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Page 143: ...137 Appendix 4 Interrupt Vector Table...
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Page 148: ...Appendix 5 I C Baud Rate Prescaler Values...
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