HCS12 datasheet(249/452 Pages) FREESCALE

tên linh kiện	HCS12

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Glossary

S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

249

Operation:

(SP) – $0002

⇒ SP

(A : B)

⇒ M(SP) :M(SP+1)

Description:

Stacks the content of double accumulator D. The stack pointer is

decremented by two, then the contents of accumulators A and B are stored

at the location to which the SP points.

After PSHD executes, the SP points to the stacked value of accumulator A.

This stacking order is the opposite of the order in which A and B are stacked

when an interrupt is recognized. The interrupt stacking order is

backward-compatible with the M6800, which had no 16-bit accumulator.

Push instructions are commonly used to save the contents of one or more

CPU registers at the start of a subroutine. Complementary pull instructions

can be used to restore the saved CPU registers just before returning from

the subroutine.

PSHD

Push Double Accumulator onto Stack

PSHD

CCR Details:

HIN

––––––––

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

PSHD

INH

HCS12 bảng dữ liệu(PDF) 249 Page - Freescale Semiconductor, Inc