Datasheet

Instruction Set

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3.4.6.35 PUSH

PUSH[.W] Push word onto stack

PUSH.B Push byte onto stack

Syntax PUSH src or PUSH.W src

PUSH.B src

Operation SP - 2 → SP

src → @SP

Description The stack pointer is decremented by two, then the source operand is moved to the RAM

word addressed by the stack pointer (TOS).

Status Bits Status bits are not affected.

Mode Bits OSCOFF, CPUOFF, and GIE are not affected.

Example The contents of the status register and R8 are saved on the stack.

PUSH SR ; save status register

PUSH R8 ; save R8

Example The contents of the peripheral TCDAT is saved on the stack.

PUSH.B &TCDAT ; save data from 8-bit peripheral module,

; address TCDAT, onto stack

NOTE: System Stack Pointer

The System stack pointer (SP) is always decremented by two,

independent of the byte suffix.

CPU SLAU144J–December 2004–Revised July 2013

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