HCS12 datasheet(174/452 Pages) FREESCALE

174 / 452 page

Instruction Glossary

S12CPUV2 Reference Manual, Rev. 4.0

174

Freescale Semiconductor

Operation:

MAX ((D), (M : M + 1))

⇒ M : M + 1

Description:

Subtracts an unsigned 16-bit value in memory from an unsigned 16-bit

value in double accumulator D 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 D 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.

EMAXM

Place Larger of Two

Unsigned 16-Bit Values

in Memory

EMAXM

CCR Details:

HIN

––––

∆∆∆∆

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

Set if result is $0000; cleared otherwise

D15

• M15 • R15 + D15 • M15 • R15

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

cleared otherwise

C: D15

• M15 + M15 • R15 + R15 • D15

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 = D – M : M + 1)

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

EMAXM oprx0_xysp

EMAXM oprx9,xysp

EMAXM oprx16,xysp

EMAXM [D,xysp]

EMAXM [oprx16,xysp]

IDX

IDX1

IDX2

[D,IDX]

[IDX2]

18 1E xb

18 1E xb ff

18 1E xb ee ff

18 1E xb

18 1E xb ee ff

ORPW

ORPWO

OfRPWP

OfIfRPW

OfIPRPW

ORPW

ORPWO

OfRPWP

OfIfRPW

OfIPRPW

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