HCS12 datasheet(70/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

5.16 Maximum and Minimum Instructions

The maximum (MAX) and minimum (MIN) instructions are used to make

comparisons between an accumulator and a memory location. These

instructions can be used for linear programming operations, such as

simplex-method optimization, or for fuzzification.

MAX and MIN instructions use accumulator A to perform 8-bit comparisons,

while EMAX and EMIN instructions use accumulator D to perform 16-bit

comparisons. The result (maximum or minimum value) can be stored in the

accumulator (EMAXD, EMIND, MAXA, MINA) or the memory address

(EMAXM, EMINM, MAXM, MINM).

Table 5-14 is a summary of minimum and maximum instructions.

Table 5-14. Minimum and Maximum Instructions

Mnemonic

Function

Operation

Minimum Instructions

EMIND

MIN of two unsigned 16-bit values

result to accumulator

MIN ((D), (M

: M + 1)) ⇒ D

EMINM

MIN of two unsigned 16-bit values

result to memory

MIN ((D), (M

: M + 1)) ⇒ M : M+1

MINA

MIN of two unsigned 8-bit values

result to accumulator

MIN ((A), (M))

⇒ A

MINM

MIN of two unsigned 8-bit values

result to memory

MIN ((A), (M))

⇒ M

Maximum Instructions

EMAXD

MAX of two unsigned 16-bit values

result to accumulator

MAX ((D), (M

: M + 1)) ⇒ D

EMAXM

MAX of two unsigned 16-bit values

result to memory

MAX ((D), (M

: M + 1)) ⇒ M : M + 1

MAXA

MAX of two unsigned 8-bit values

result to accumulator

MAX ((A), (M))

⇒ A

MAXM

MAX of two unsigned 8-bit values

result to memory

MAX ((A), (M))

⇒ M

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