Datasheet

Instruction Set Description

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4.6.3.18 POPM

POPM.A Restore n CPU registers (20-bit data) from the stack

POPM.[W] Restore n CPU registers (16-bit data) from the stack

POPM.A #n,Rdst

Syntax 1 ≤ n ≤ 16

POPM.W #n,Rdst or POPM #n,Rdst

1 ≤ n ≤ 16

Operation POPM.A: Restore the register values from stack to the specified CPU registers. The SP

is incremented by four for each register restored from stack. The 20-bit values from

stack (two words per register) are restored to the registers.

POPM.W: Restore the 16-bit register values from stack to the specified CPU registers.

The SP is incremented by two for each register restored from stack. The 16-bit values

from stack (one word per register) are restored to the CPU registers.

Note : This instruction does not use the extension word.

Description POPM.A: The CPU registers pushed on the stack are moved to the extended CPU

registers, starting with the CPU register (Rdst – n + 1). The SP is incremented by (n ×

4) after the operation.

POPM.W: The 16-bit registers pushed on the stack are moved back to the CPU

registers, starting with CPU register (Rdst – n + 1). The SP is incremented by (n × 2)

after the instruction. The MSBs (Rdst.19:16) of the restored CPU registers are cleared.

Status Bits Status bits are not affected, except SR is included in the operation.

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

Example Restore the 20-bit registers R9, R10, R11, R12, R13 from the stack

POPM.A #5,R13 ; Restore R9, R10, R11, R12, R13

Example Restore the 16-bit registers R9, R10, R11, R12, R13 from the stack.

POPM.W #5,R13 ; Restore R9, R10, R11, R12, R13

234

CPUX SLAU144J–December 2004–Revised July 2013

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