HCS12 datasheet(352/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

352

Freescale Semiconductor

9.4.2.2 Abnormal Membership Function Case 2

Like the previous example, the membership function in case 2 is abnormal

because the sloping sides cross below the $FF cutoff level, but the left

sloping side reaches the $FF cutoff level before the input gets to point_2. In

this case, the result follows the left sloping side until it reaches the $FF cutoff

level. At this point, the (grade_1 > $FF) term of 4b kicks in, making the

expression true so grade equals grade (no overwrite). The result from here

to point_2 becomes controlled by the “else” part of 4a (grade = grade_2),

and the result follows the right sloping side.

Figure 9-7. Abnormal Membership Function Case 2

9.4.2.3 Abnormal Membership Function Case 3

The membership function in case 3 is abnormal because the sloping sides

cross below the $FF cutoff level, and the left sloping side has infinite slope.

In this case, 4a is not true, so grade equals grade_2. 4b is true because

slope_1 is zero, so 4b does not overwrite grade.

Figure 9-8. Abnormal Membership Function Case 3

MEMORY DEFINITION: $60, $C0, $04, $04; point_1, point_2, slope_1, slope_2

GRAPHICAL REPRESENTATION

HOW INTERPRETED

LEFT SIDE

CROSSES $FF

MEMORY DEFINITION: $60, $80, $00, $04; point_1, point_2, slope_1, slope_2

GRAPHICAL REPRESENTATION

HOW INTERPRETED

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