HCS12 datasheet(160/452 Pages) FREESCALE

160 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

160

Freescale Semiconductor

Operation:

(Y) – (M : M + 1)

Description:

Compares the content of index register Y to 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 Y without

modifying either Y or (M : M + 1).

CPY

Compare Index Register Y

CPY

CCR Details:

HIN

––––

∆∆∆∆

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

Z: Set if result is $0000; cleared otherwise

V: Y15

• M15 • R15 + Y15 • M15 • R15

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

cleared otherwise

C: Y15

• M15 + M15 • R15 + R15 • Y15

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

CPY #opr16i

CPY opr8a

CPY opr16a

CPY oprx0_xysp

CPY oprx9,xysp

CPY oprx16,xysp

CPY [D,xysp]

CPY [oprx16,xysp]

IMM

DIR

EXT

IDX

IDX1

IDX2

[D,IDX]

[IDX2]

8D jj kk

9D dd

BD hh ll

AD xb

AD xb ff

AD xb ee ff

AD xb

AD xb ee ff

RPf

RPO

RPf

RPO

fRPP

fIfRPf

fIPRPf

RfP

ROP

RfP

RPO

fRPP

fIfRfP

fIPRfP

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