HCS12 datasheet(82/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

5.24 Stacking Instructions

The two types of stacking instructions, are shown in Table 5-24. Stack

pointer instructions use specialized forms of mathematical and data transfer

instructions to perform stack pointer manipulation. Stack operation

instructions save information on and retrieve information from the system

stack.

Table 5-24. Stacking Instructions

Mnemonic

Function

Operation

Stack Pointer Instructions

CPS

Compare SP to memory

(SP) – (M

: M + 1)

DES

Decrement SP

(SP) – 1

⇒ SP

INS

Increment SP

(SP)

+ 1 ⇒ SP

LDS

Load SP

: M + 1) ⇒ SP

LEAS

Load effective address

into SP

Effective address

⇒ SP

STS

Store SP

(SP)

⇒ M : M + 1

TSX

Transfer SP to X

(SP)

⇒ X

TSY

Transfer SP to Y

(SP)

⇒ Y

TXS

Transfer X to SP

(X)

⇒ SP

TYS

Transfer Y to SP

(Y)

⇒ SP

Stack Operation Instructions

PSHA

Push A

(SP) – 1

⇒ SP; (A) ⇒ M(SP)

PSHB

Push B

(SP) – 1

⇒ SP; (B) ⇒ M(SP)

PSHC

Push CCR

(SP) – 1

⇒ SP; (A) ⇒ M(SP)

PSHD

Push D

(SP) – 2

⇒ SP; (A : B) ⇒ M(SP) : M(SP+1)

PSHX

Push X

(SP) – 2

⇒ SP; (X) ⇒ M(SP) : M(SP+1)

PSHY

Push Y

(SP) – 2

⇒ SP; (Y) ⇒ M(SP) : M(SP+1)

PULA

Pull A

(M(SP)) ⇒ A; (SP) + 1 ⇒ SP

PULB

Pull B

(M(SP)) ⇒ B; (SP) + 1 ⇒ SP

PULC

Pull CCR

(M(SP)) ⇒ CCR; (SP) + 1 ⇒ SP

PULD

Pull D

(M(SP) : M(SP+1)) ⇒ A : B; (SP) + 2 ⇒ SP

PULX

Pull X

(M(SP) : M(SP+1)) ⇒ X; (SP) + 2 ⇒ SP

PULY

Pull Y

(M(SP) : M(SP+1)) ⇒ Y; (SP) + 2 ⇒ SP

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