HCS12 datasheet(182/452 Pages) FREESCALE

182 / 452 page

Instruction Glossary

S12CPUV2 Reference Manual, Rev. 4.0

182

Freescale Semiconductor

Operation:

See table

Description:

Exchanges the contents of registers specified in the instruction as shown

below. Note that the order in which exchanges between 8-bit and 16-bit

registers are specified affects the high byte of the 16-bit registers differently.

Exchanges of D with A or B are ambiguous. Cases involving TMP2 and

TMP3 are reserved for Freescale use, so some assemblers may not permit

their use, but it is possible to generate these cases by using DC.B or DC.W

assembler directives.

None affected, unless the CCR is the destination register. Condition codes

take on the value of the corresponding source bits, except that the X mask

bit cannot change from 0 to 1. Software can leave the X bit set, leave it

cleared, or change it from 1 to 0, but it can be set only in response to any

reset or by recognition of an XIRQ interrupt.

EXG

Exchange Register Contents

EXG

CCR Details:

HIN

Or:

HIN

––––––––

∆⇓∆∆∆∆∆∆

Source Form

Address

Mode

Object Code(1)

1. Legal coding for eb is summarized in the following table. Columns represent the high-order source digit. Rows represent

the low-order destination digit (bit 3 is a don’t care). Values are in hexadecimal.

Access Detail

HCS12

M68HC12

EXG abcdxys,abcdxys

INH

B7 eb

⇔ AB ⇔ A

CCR

⇔ A

TMP3L ⇒ A

$00:A

⇒ TMP3

⇒ A

⇒ B

XL ⇒ A

$00:A

⇒ X

YL ⇒ A

$00:A

⇒ Y

SPL ⇒ A

$00:A

⇒ SP

⇔ BB ⇔ B

CCR

⇔ B

TMP3L ⇒ B

$FF:B

⇒ TMP3

⇒ B

$FF

⇒ A

XL ⇒ B

$FF:B

⇒ X

YL ⇒ B

$FF:B

⇒ Y

SPL ⇒ B

$FF:B

⇒ SP

⇔ CCR

CCR

⇔ CCR

TMP3L ⇒ CCR

$FF:CCR

⇒ TMP3

⇒ CCR

$FF:CCR

⇒ D

XL ⇒ CCR

$FF:CCR

⇒ X

YL ⇒ CCR

$FF:CCR

⇒ Y

SPL ⇒ CCR

$FF:CCR

⇒ SP

$00:A

⇒ TMP2

TMP2L ⇒ A

$00:B

⇒ TMP2

TMP2L ⇒ B

$00:CCR

⇒ TMP2

TMP2L ⇒ CCR

TMP3

⇔ TMP2

$00:A

⇒ D

$00:B

⇒ D

$00:CCR

⇒ D

⇒ CCR

TMP3

⇔ DD ⇔ DX ⇔ DY ⇔ DSP ⇔ D

$00:A

⇒ X

XL ⇒ A

$00:B

⇒ X

XL ⇒ B

$00:CCR

⇒ X

XL ⇒ CCR

TMP3

⇔ XD ⇔ XX ⇔ XY ⇔ XSP ⇔ X

$00:A

⇒ Y

YL ⇒ A

$00:B

⇒ Y

YL ⇒ B

$00:CCR

⇒ Y

YL ⇒ CCR

TMP3

⇔ YD ⇔ YX ⇔ YY ⇔ YSP ⇔ Y

$00:A

⇒ SP

SPL ⇒ A

$00:B

⇒ SP

SPL ⇒ B

$00:CCR

⇒ SP

SPL ⇒ CCR

TMP3

⇔ SP

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