HCS12 datasheet(157/452 Pages) FREESCALE

157 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

157

Operation:

(A : B) – (M : M + 1)

Description:

Compares the content of double accumulator D 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 D without

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

CPD

Compare Double Accumulator

CPD

CCR Details:

HIN

––––

∆∆∆∆

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

Z: Set if result is $0000; cleared otherwise

V: D15

• M15 • R15 + D15 • M15 • R15

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

cleared otherwise

C: D15

• M15 + M15 • R15 + R15 • D15

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

absolute value of the accumulator; cleared otherwise

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

CPD #opr16i

CPD opr8a

CPD opr16a

CPD oprx0_xysp

CPD oprx9,xysp

CPD oprx16,xysp

CPD [D,xysp]

CPD [oprx16,xysp]

IMM

DIR

EXT

IDX

IDX1

IDX2

[D,IDX]

[IDX2]

8C jj kk

9C dd

BC hh ll

AC xb

AC xb ff

AC xb ee ff

AC xb

AC xb ee ff

RPf

RPO

RPf

RPO

fRPP

fIfRPf

fIPRPf

RfP

ROP

RfP

RPO

fRPP

fIfRfP

fIPRfP

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