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Instruction Set Description

4.6.3.21 PUSHX

PUSHX.A Save single address-word to the stack

PUSHX.[W] Save single word to the stack

PUSHX.B Save single byte to the stack

PUSHX.A src

Syntax

PUSHX src or PUSHX.W src

PUSHX.B src

Operation Save the 8-/16-/20-bit value of the source operand on the TOS. 20-bit addresses are

possible. The SP is decremented by two (byte and word operands) or by four (address-

word operand) before the write operation.

Description The SP is decremented by two (byte and word operands) or by four (address-word

operand). Then the source operand is written to the TOS. All seven addressing modes

are possible for the source operand.

Status Bits Status bits are not affected.

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

Example Save the byte at the 20-bit address &EDE on the stack

PUSHX.B &EDE ; Save byte at address EDE

Example Save the 20-bit value in R9 on the stack.

PUSHX.A R9 ; Save address-word in R9

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SLAU144J–December 2004–Revised July 2013 CPUX

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