HCS12 datasheet(159/452 Pages) FREESCALE

159 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

159

Operation:

(X) – (M : M + 1)

Description:

Compares the content of index register X with a 16-bit value at the address

specified and sets the condition codes accordingly. The compare is

accomplished internally by a 16-bit subtract of (M : M + 1) from index register

X without modifying either index register X or (M : M + 1).

CPX

Compare Index Register X

CPX

CCR Details:

HIN

––––

∆∆∆∆

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

Z: Set if result is $0000; cleared otherwise

V: X15

• M15 • R15 + X15 • M15 • R15

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

cleared otherwise

C: X15

• M15 + M15 • R15 + R15 • X15

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

absolute value of the index register; cleared otherwise

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

CPX #opr16i

CPX opr8a

CPX opr16a

CPX oprx0_xysp

CPX oprx9,xysp

CPX oprx16,xysp

CPX [D,xysp]

CPX [oprx16,xysp]

IMM

DIR

EXT

IDX

IDX1

IDX2

[D,IDX]

[IDX2]

8E jj kk

9E dd

BE hh ll

AE xb

AE xb ff

AE xb ee ff

AE xb

AE xb ee ff

RPf

RPO

RPf

RPO

fRPP

fIfRPf

fIPRPf

RfP

ROP

RfP

RPO

fRPP

fIfRfP

fIPRfP

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