HCS12 datasheet(234/452 Pages) FREESCALE

234 / 452 page

Instruction Glossary

S12CPUV2 Reference Manual, Rev. 4.0

234

Freescale Semiconductor

Operation:

MIN ((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 smaller of the

two values in accumulator 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 = 0, the value in accumulator 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 smallest value in a list of values.

MINA

Place Smaller of Two

Unsigned 8-Bit Values

in Accumulator A

MINA

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

MINA oprx0_xysp

MINA oprx9,xysp

MINA oprx16,xysp

MINA [D,xysp]

MINA [oprx16,xysp]

IDX

IDX1

IDX2

[D,IDX]

[IDX2]

18 19 xb

18 19 xb ff

18 19 xb ee ff

18 19 xb

18 19 xb ee ff

OrPf

OrPO

OfrPP

OfIfrPf

OfIPrPf

OrfP

OrPO

OfrPP

OfIfrfP

OfIPrfP

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