HCS12 datasheet(232/452 Pages) FREESCALE

232 / 452 page

Instruction Glossary

S12CPUV2 Reference Manual, Rev. 4.0

232

Freescale Semiconductor

Operation:

MAX ((A), (M))

⇒ M

Description:

Subtracts an unsigned 8-bit value in memory from an unsigned 8-bit value

in accumulator A to determine which is larger and leaves the larger of the

two values in the memory location. The Z status bit is set when the result of

the subtraction is zero (the values are equal), and the C status bit is set

when the subtraction requires a borrow (the value in memory is larger than

the value in the accumulator). When C = 0, the value in accumulator A has

replaced the value in memory.

The unsigned value in memory is accessed by means of indexed

addressing modes, which allow a great deal of flexibility in specifying the

address of the operand.

MAXM Place Larger of Two Unsigned 8-Bit Values

in Memory

MAXM

CCR Details:

HIN

––––

∆∆∆∆

N: Set if MSB of result is set; cleared otherwise

Z: Set if result is $00; cleared otherwise

V: A7

• M7 • R7 + A7 • M7 • R7

Set if a two’s complement overflow resulted from the operation;

cleared otherwise

C: A7

• M7 + M7 • R7 + R7 • A7

Set if the value of the content of memory is larger than the value of

the accumulator; cleared otherwise

Condition codes reflect internal subtraction (R = A – M)

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

MAXM oprx0_xysp

MAXM oprx9,xysp

MAXM oprx16,xysp

MAXM [D,xysp]

MAXM [oprx16,xysp]

IDX

IDX1

IDX2

[D,IDX]

[IDX2]

18 1C xb

18 1C xb ff

18 1C xb ee ff

18 1C xb

18 1C xb ee ff

OrPw

OrPwO

OfrPwP

OfIfrPw

OfIPrPw

OrPw

OrPwO

OfrPwP

OfIfrPw

OfIPrPw

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