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Instruction Set Description

4.6.3.19 PUSHM

PUSHM.A Save n CPU registers (20-bit data) on the stack

PUSHM.[W] Save n CPU registers (16-bit words) on the stack

PUSHM.A #n,Rdst

Syntax 1 ≤ n ≤ 16

PUSHM.W #n,Rdst or PUSHM #n,Rdst

1 ≤ n ≤ 16

Operation PUSHM.A: Save the 20-bit CPU register values on the stack. The SP is decremented

by four for each register stored on the stack. The MSBs are stored first (higher

address).

PUSHM.W: Save the 16-bit CPU register values on the stack. The SP is decremented

by two for each register stored on the stack.

Description PUSHM.A: The n CPU registers, starting with Rdst backwards, are stored on the stack.

The SP is decremented by (n × 4) after the operation. The data (Rn.19:0) of the pushed

CPU registers is not affected.

PUSHM.W: The n registers, starting with Rdst backwards, are stored on the stack. The

SP is decremented by (n × 2) after the operation. The data (Rn.19:0) of the pushed

CPU registers is not affected.

Note : This instruction does not use the extension word.

Status Bits Status bits are not affected.

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

Example Save the five 20-bit registers R9, R10, R11, R12, R13 on the stack

PUSHM.A #5,R13 ; Save R13, R12, R11, R10, R9

Example Save the five 16-bit registers R9, R10, R11, R12, R13 on the stack

PUSHM.W #5,R13 ; Save R13, R12, R11, R10, R9

235

SLAU144J–December 2004–Revised July 2013 CPUX

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