HCS12 datasheet(233/452 Pages) FREESCALE

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Glossary

S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

233

Operation:

Grade of Membership

⇒ M(Y)

(Y) + $0001

⇒ Y

(X) + $0004

⇒ X

Description:

Before executing MEM, initialize A, X, and Y. Load A with the current crisp

value of a system input variable. Load Y with the fuzzy input RAM location

where the grade of membership is to be stored. Load X with the first address

of a 4-byte data structure that describes a trapezoidal membership function.

The data structure consists of:

• Point_1 — The x-axis starting point for the leading side (at MX)

• Point_2 — The x-axis position of the rightmost point (at MX+1)

• Slope_1 — The slope of the leading side (at MX+2)

• Slope_2 — The slope of the trailing side (at MX+3); the right side

slopes up and to the left from point_2

A slope_1 or slope_2 value of $00 is a special case in which the

membership function either starts with a grade of $FF at input = point_1, or

ends with a grade of $FF at input = point_2 (infinite slope).

During execution, the value of A remains unchanged. X is incremented by

four and Y is incremented by one.

H, N, Z, V, and C may be altered by this instruction.

MEM

Determine Grade of Membership

(Fuzzy Logic)

MEM

CCR Details:

HIN

––

–

????

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

MEM

Special

RRfOw

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