HCS12 datasheet(341/452 Pages) FREESCALE

341 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

341

percent true ($40). The value $40 is stored to a random-access memory

(RAM) location and is called a fuzzy input (in this case, the fuzzy input for

“temperature is warm”). There is a RAM location for each fuzzy input (for

each label of each system input).

Figure 9-2. Fuzzification Using Membership Functions

When the fuzzification step begins, the current value of the system input is

in an accumulator of the CPU12, one index register points to the first

membership function definition in the knowledge base, and a second index

calculated by executing a MEM instruction, the result is stored to the fuzzy

input and both pointers are updated automatically to point to the locations

associated with the next fuzzy input. The MEM instruction takes care of

everything except counting the number of labels per system input and

loading the current value of any subsequent system inputs.

The end result of the fuzzification step is a table of fuzzy inputs representing

current system conditions.

$00

$80

$FF

°F32°F64°F96°F

128

°F

$40

$C0

HOT

$00

$80

$FF

°F32°F64°F96°F

128

°F

$40

$C0

WARM

$00

$80

$FF

°F32°F64°F96°F

128

°F

$40

$C0

COLD

CURRENT

IS 64

°F

TEMPERATURE

MEMBERSHIP FUNCTIONS

FOR TEMPERATURE

FUZZY INPUTS

TEMPERATURE IS HOT

TEMPERATURE IS WARM

TEMPERATURE IS COLD

$00

$40

$C0

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