HCS12 datasheet(231/452 Pages) FREESCALE

231 / 452 page

Glossary

S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

231

Operation:

MAX ((A), (M))

⇒ A

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 A. 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 When C = 1, the value in A has been replaced by the value in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. Auto increment/decrement variations of indexed

addressing facilitate finding the largest value in a list of values.

MAXA Place Larger of Two Unsigned 8-Bit Values

in Accumulator A

MAXA

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

MAXA oprx0_xysp

MAXA oprx9,xysp

MAXA oprx16,xysp

MAXA [D,xysp]

MAXA [oprx16,xysp]

IDX

IDX1

IDX2

[D,IDX]

[IDX2]

18 18 xb

18 18 xb ff

18 18 xb ee ff

18 18 xb

18 18 xb ee ff

OrPf

OrPO

OfrPP

OfIfrPf

OfIPrPf

OrfP

OrPO

OfrPP

OfIfrfP

OfIPrfP

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